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/*
So you like the style of impress.js demo?
Or maybe you are just curious how it was done?
You couldn't find a better place to find out!
Welcome to the stylesheet impress.js demo presentation.
Please remember that it is not meant to be a part of impress.js and is
not required by impress.js.
I expect that anyone creating a presentation for impress.js would create
their own set of styles.
But feel free to read through it and learn how to get the most of what
impress.js provides.
And let me be your guide.
Shall we begin?
*/
/*
We start with a good ol' reset.
That's the one by Eric Meyer http://meyerweb.com/eric/tools/css/reset/
You can probably argue if it is needed here, or not, but for sure it
doesn't do any harm and gives us a fresh start.
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
/*
Now here is when interesting things start to appear.
We set up <body> styles with default font and nice gradient in the background.
And yes, there is a lot of repetition there because of -prefixes but we don't
want to leave anybody behind.
*/
body {
font-family: 'PT Sans', sans-serif;
min-height: 740px;
background: rgb(215, 215, 215);
background: -webkit-gradient(radial, 50% 50%, 0, 50% 50%, 500, from(rgb(240, 240, 240)), to(rgb(190, 190, 190)));
background: -webkit-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
background: -moz-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
background: -ms-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
background: -o-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
background: radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
}
/*
Now let's bring some text styles back ...
*/
b, strong { font-weight: bold }
i, em { font-style: italic }
/*
... and give links a nice look.
*/
a {
color: inherit;
text-decoration: none;
padding: 0 0.1em;
background: rgba(255,255,255,0.5);
text-shadow: -1px -1px 2px rgba(100,100,100,0.9);
border-radius: 0.2em;
-webkit-transition: 0.5s;
-moz-transition: 0.5s;
-ms-transition: 0.5s;
-o-transition: 0.5s;
transition: 0.5s;
}
a:hover,
a:focus {
background: rgba(255,255,255,1);
text-shadow: -1px -1px 2px rgba(100,100,100,0.5);
}
/*
Because the main point behind the impress.js demo is to demo impress.js
we display a fallback message for users with browsers that don't support
all the features required by it.
All of the content will be still fully accessible for them, but I want
them to know that they are missing something - that's what the demo is
about, isn't it?
And then we hide the message, when support is detected in the browser.
*/
.fallback-message {
font-family: sans-serif;
line-height: 1.3;
width: 780px;
padding: 10px 10px 0;
margin: 20px auto;
border: 1px solid #E4C652;
border-radius: 10px;
background: #EEDC94;
}
.fallback-message p {
margin-bottom: 10px;
}
.impress-supported .fallback-message {
display: none;
}
/*
Now let's style the presentation steps.
We start with basics to make sure it displays correctly in everywhere ...
*/
.step {
position: relative;
width: 900px;
padding: 40px;
margin: 20px auto;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
-o-box-sizing: border-box;
box-sizing: border-box;
font-family: 'PT Serif', georgia, serif;
font-size: 48px;
line-height: 1.5;
}
/*
... and we enhance the styles for impress.js.
Basically we remove the margin and make inactive steps a little bit transparent.
*/
.impress-enabled .step {
margin: 0;
opacity: 0.3;
-webkit-transition: opacity 1s;
-moz-transition: opacity 1s;
-ms-transition: opacity 1s;
-o-transition: opacity 1s;
transition: opacity 1s;
}
.impress-enabled .step.active { opacity: 1 }
/*
These 'slide' step styles were heavily inspired by HTML5 Slides:
http://html5slides.googlecode.com/svn/trunk/styles.css
;)
They cover everything what you see on first three steps of the demo.
*/
.slide {
display: block;
width: 900px;
height: 500px;
padding: 40px 60px;
background-color: white;
border: 1px solid rgba(0, 0, 0, .3);
border-radius: 10px;
box-shadow: 0 2px 6px rgba(0, 0, 0, .1);
color: rgb(102, 102, 102);
text-shadow: 0 2px 2px rgba(0, 0, 0, .1);
font-family: 'Open Sans', Arial, sans-serif;
font-size: 30px;
line-height: 36px;
letter-spacing: -1px;
}
.slide q {
display: block;
font-size: 50px;
line-height: 72px;
margin-top: 40px;
}
.slide q strong {
white-space: nowrap;
}
.slide h1 {
font-size: 120px;
-webkit-transform: translateZ(50px);
-moz-transform: translateZ(50px);
-ms-transform: translateZ(50px);
-o-transform: translateZ(50px);
transform: translateZ(50px);
}
.slide q p {
font-size: 30px;
line-height: 45px;
}
/*
And now we start to style each step separately.
I agree that this may be not the most efficient, object-oriented and
scalable way of styling, but most of steps have quite a custom look
and typography tricks here and there, so they had to be styled separately.
First is the title step with a big <h1> (no room for padding) and some
3D positioning along Z axis.
*/
#title {
padding: 0;
}
#title .try {
font-size: 64px;
position: absolute;
top: -0.5em;
left: 1.5em;
-webkit-transform: translateZ(20px);
-moz-transform: translateZ(20px);
-ms-transform: translateZ(20px);
-o-transform: translateZ(20px);
transform: translateZ(20px);
}
#title h1 {
font-size: 190px;
-webkit-transform: translateZ(50px);
-moz-transform: translateZ(50px);
-ms-transform: translateZ(50px);
-o-transform: translateZ(50px);
transform: translateZ(50px);
}
#title .footnote {
font-size: 32px;
}
/*
Second step is nothing special, just a text with a link, so it doesn't need
any special styling.
Let's move to 'big thoughts' with centered text and custom font sizes.
*/
#big {
width: 600px;
text-align: center;
font-size: 60px;
line-height: 1;
}
#big b {
display: block;
font-size: 250px;
line-height: 250px;
}
#big .thoughts {
font-size: 90px;
line-height: 150px;
}
/*
'Tiny ideas' just need some tiny styling.
*/
#tiny {
width: 500px;
text-align: center;
}
/*
This step has some animated text ...
*/
#ing { width: 500px }
/*
... so we define display to `inline-block` to enable transforms and
transition duration to 0.5s ...
*/
#ing b {
display: inline-block;
-webkit-transition: 0.5s;
-moz-transition: 0.5s;
-ms-transition: 0.5s;
-o-transition: 0.5s;
transition: 0.5s;
}
/*
... and we want 'positioning` word to move up a bit when the step gets
`present` class ...
*/
#ing.present .positioning {
-webkit-transform: translateY(-10px);
-moz-transform: translateY(-10px);
-ms-transform: translateY(-10px);
-o-transform: translateY(-10px);
transform: translateY(-10px);
}
/*
... 'rotating' to rotate a quarter of a second later ...
*/
#ing.present .rotating {
-webkit-transform: rotate(-10deg);
-moz-transform: rotate(-10deg);
-ms-transform: rotate(-10deg);
-o-transform: rotate(-10deg);
transform: rotate(-10deg);
-webkit-transition-delay: 0.25s;
-moz-transition-delay: 0.25s;
-ms-transition-delay: 0.25s;
-o-transition-delay: 0.25s;
transition-delay: 0.25s;
}
/*
... and 'scaling' to scale down after another quarter of a second.
*/
#ing.present .scaling {
-webkit-transform: scale(0.7);
-moz-transform: scale(0.7);
-ms-transform: scale(0.7);
-o-transform: scale(0.7);
transform: scale(0.7);
-webkit-transition-delay: 0.5s;
-moz-transition-delay: 0.5s;
-ms-transition-delay: 0.5s;
-o-transition-delay: 0.5s;
transition-delay: 0.5s;
}
/*
The 'imagination' step is again some boring font-sizing.
*/
#imagination {
width: 600px;
}
#imagination .imagination {
font-size: 78px;
}
/*
There is nothing really special about 'use the source, Luke' step, too,
except maybe of the Yoda background.
As you can see below I've 'hard-coded' it in data URL.
That's not the best way to serve images, but because that's just this one
I decided it will be OK to have it this way.
Just make sure you don't blindly copy this approach.
*/
#source {
width: 700px;
padding-bottom: 300px;
/* Yoda Icon :: Pixel Art from Star Wars http://www.pixeljoint.com/pixelart/1423.htm */
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAARgAAAEYCAMAAACwUBm+AAAAAXNSR0IArs4c6QAAAKtQTFRFsAAAvbWSLUUrLEQqY1s8UYJMqJ1vNTEgOiIdIzYhjIFVLhsXZ6lgSEIsP2U8JhcCVzMsSXZEgXdOO145XJdWOl03LzAYMk4vSXNExr+hwcuxRTs1Qmk+RW9Am49eFRANQz4pUoNMQWc+OSMDTz0wLBsCNVMxa2NBOyUDUoNNSnlEWo9VRGxAVzYFl6tXCggHbLNmMUIcHhwTXkk5f3VNRT8wUT8xAAAACQocRBWFFwAAAAF0Uk5TAEDm2GYAAAPCSURBVHja7d3JctNAFIZRMwRCCGEmzPM8z/D+T8bu/ptbXXJFdij5fMt2Wuo+2UgqxVmtttq5WVotLzBgwIABAwYMGDCn0qVqbo69psPqVpWx+1XG5iaavF8wYMCAAQMGDBgwi4DJ6Y6qkxB1HNlcN3a92gbR5P2CAQMGDBgwYMCAWSxMlrU+UY5yu2l9okfV4bAxUVbf7TJnAwMGDBgwYMCAAbMLMHeqbGR82Zy+VR1Ht81nVca6R+UdTLaU24Ruzd3qM/e4yjnAgAEDBgwYMGDA7AJMd1l/3NRdVGcj3eX/2WEhCmDGxnM7yqygu8XIPjJj8iN/MGDAgAEDBgwYMAuDGb8q0RGlLCHLv1t9qDKWn3vdNHVuEI6HPaxO9Jo3GDBgwIABAwYMmIXBdC9ShGgMk+XnkXUeuGcsP/e1+lhNnZsL/G5Vs3OAAQMGDBgwYMCAWSxMR3SzOmraG5atdy9wZKzb+vg16qyqe2FltbnAgAEDBgwYMGDALAxmTJSuN3WA76rnVca6GTnemGN1WoEBAwYMGDBgwIBZGMxUomy4+xO899V4LAg5Xnc2MGDAgAEDBgwYMGA218Wq+2K1LDqvY9xZu8zN8fICdM6btYABAwYMGDBgwIABMzfH0+pGU5afze2tXebmeAfVz+p8BQYMGDBgwIABAwbMPBzZ+oWmfJrln1273FhkbHzee9WWbw7AgAEDBgwYMGDALAKm43hcdctKgblcPamOhuXnXlY5Xs6bsW4FGyQCAwYMGDBgwIABswiYMceZKgvMo+h8mrHLTdn676rj+FEFoTtHd8MwOxEYMGDAgAEDBgyYRcBM5UhXqiymW3R3c9ARhWO/OmjqfjVZy+xEYMCAAQMGDBgwYBYG073OnCV0RFNhMhaOa9WfKmOB6XjHMN1tQmaAAQMGDBgwYMCA2VWY7vXjz1U4croAzgPztwIDBgwYMGDAgAEDZhswh035NBw59Dww3RgYMGDAgAEDBgwYMJuD6f4tXT7NUqfCdBvZLkxXdgQGDBgwYMCAAQNmt2DGj8WzwAfV/w7T/aq7mxwwYMCAAQMGDBgwuwqTOo7uTwTngflSzQ3TdaJvAwEDBgwYMGDAgAED5gSvgbyo5oHZ4Pc+gwEDBgwYMGDAgAEzhOm+5G0qTGaAAQMGDBgwYMCAAXNaMOcnls3tNwWm+zRzp54NDBgwYMCAAQMGDJh5YNL36k1TLuGvVq+qnKMbS5n7tulT9asCAwYMGDBgwIABA2ZumKuztLnjgQEDBgwYMGDAgNl5mH/4/ltKA6vBNAAAAABJRU5ErkJggg==);
background-position: bottom right;
background-repeat: no-repeat;
}
#source q {
font-size: 60px;
}
/*
And the "it's in 3D" step again brings some 3D typography - just for fun.
Because we want to position <span> elements in 3D we set transform-style to
`preserve-3d` on the paragraph.
It is not needed by webkit browsers, but it is in Firefox. It's hard to say
which behaviour is correct as 3D transforms spec is not very clear about it.
*/
#its-in-3d p {
-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d; /* Y U need this Firefox?! */
-ms-transform-style: preserve-3d;
-o-transform-style: preserve-3d;
transform-style: preserve-3d;
}
/*
Below we position each word separately along Z axis and we want it to transition
to default position in 0.5s when the step gets `present` class.
Quite a simple idea, but lot's of styles and prefixes.
*/
#its-in-3d span,
#its-in-3d b {
display: inline-block;
-webkit-transform: translateZ(40px);
-moz-transform: translateZ(40px);
-ms-transform: translateZ(40px);
-o-transform: translateZ(40px);
transform: translateZ(40px);
-webkit-transition: 0.5s;
-moz-transition: 0.5s;
-ms-transition: 0.5s;
-o-transition: 0.5s;
transition: 0.5s;
}
#its-in-3d .have {
-webkit-transform: translateZ(-40px);
-moz-transform: translateZ(-40px);
-ms-transform: translateZ(-40px);
-o-transform: translateZ(-40px);
transform: translateZ(-40px);
}
#its-in-3d .you {
-webkit-transform: translateZ(20px);
-moz-transform: translateZ(20px);
-ms-transform: translateZ(20px);
-o-transform: translateZ(20px);
transform: translateZ(20px);
}
#its-in-3d .noticed {
-webkit-transform: translateZ(-40px);
-moz-transform: translateZ(-40px);
-ms-transform: translateZ(-40px);
-o-transform: translateZ(-40px);
transform: translateZ(-40px);
}
#its-in-3d .its {
-webkit-transform: translateZ(60px);
-moz-transform: translateZ(60px);
-ms-transform: translateZ(60px);
-o-transform: translateZ(60px);
transform: translateZ(60px);
}
#its-in-3d .in {
-webkit-transform: translateZ(-10px);
-moz-transform: translateZ(-10px);
-ms-transform: translateZ(-10px);
-o-transform: translateZ(-10px);
transform: translateZ(-10px);
}
#its-in-3d .footnote {
font-size: 32px;
-webkit-transform: translateZ(-10px);
-moz-transform: translateZ(-10px);
-ms-transform: translateZ(-10px);
-o-transform: translateZ(-10px);
transform: translateZ(-10px);
}
#its-in-3d.present span,
#its-in-3d.present b {
-webkit-transform: translateZ(0px);
-moz-transform: translateZ(0px);
-ms-transform: translateZ(0px);
-o-transform: translateZ(0px);
transform: translateZ(0px);
}
/*
The last step is an overview.
There is no content in it, so we make sure it's not visible because we want
to be able to click on other steps.
*/
#overview { display: none }
/*
We also make other steps visible and give them a pointer cursor using the
`impress-on-` class.
*/
.impress-on-overview .step {
opacity: 1;
cursor: pointer;
}
/*
Now, when we have all the steps styled let's give users a hint how to navigate
around the presentation.
The best way to do this would be to use JavaScript, show a delayed hint for a
first time users, then hide it and store a status in cookie or localStorage...
But I wanted to have some CSS fun and avoid additional scripting...
Let me explain it first, so maybe the transition magic will be more readable
when you read the code.
First of all I wanted the hint to appear only when user is idle for a while.
You can't detect the 'idle' state in CSS, but I delayed a appearing of the
hint by 5s using transition-delay.
You also can't detect in CSS if the user is a first-time visitor, so I had to
make an assumption that I'll only show the hint on the first step. And when
the step is changed hide the hint, because I can assume that user already
knows how to navigate.
To summarize it - hint is shown when the user is on the first step for longer
than 5 seconds.
The other problem I had was caused by the fact that I wanted the hint to fade
in and out. It can be easily achieved by transitioning the opacity property.
But that also meant that the hint was always on the screen, even if totally
transparent. It covered part of the screen and you couldn't correctly clicked
through it.
Unfortunately you cannot transition between display `block` and `none` in pure
CSS, so I needed a way to not only fade out the hint but also move it out of
the screen.
I solved this problem by positioning the hint below the bottom of the screen
with CSS transform and moving it up to show it. But I also didn't want this move
to be visible. I wanted the hint only to fade in and out visually, so I delayed
the fade in transition, so it starts when the hint is already in its correct
position on the screen.
I know, it sounds complicated ... maybe it would be easier with the code?
*/
.hint {
/*
We hide the hint until presentation is started and from browsers not supporting
impress.js, as they will have a linear scrollable view ...
*/
display: none;
/*
... and give it some fixed position and nice styles.
*/
position: fixed;
left: 0;
right: 0;
bottom: 200px;
background: rgba(0,0,0,0.5);
color: #EEE;
text-align: center;
font-size: 50px;
padding: 20px;
z-index: 100;
/*
By default we don't want the hint to be visible, so we make it transparent ...
*/
opacity: 0;
/*
... and position it below the bottom of the screen (relative to it's fixed position)
*/
-webkit-transform: translateY(400px);
-moz-transform: translateY(400px);
-ms-transform: translateY(400px);
-o-transform: translateY(400px);
transform: translateY(400px);
/*
Now let's imagine that the hint is visible and we want to fade it out and move out
of the screen.
So we define the transition on the opacity property with 1s duration and another
transition on transform property delayed by 1s so it will happen after the fade out
on opacity finished.
This way user will not see the hint moving down.
*/
-webkit-transition: opacity 1s, -webkit-transform 0.5s 1s;
-moz-transition: opacity 1s, -moz-transform 0.5s 1s;
-ms-transition: opacity 1s, -ms-transform 0.5s 1s;
-o-transition: opacity 1s, -o-transform 0.5s 1s;
transition: opacity 1s, transform 0.5s 1s;
}
/*
Now we 'enable' the hint when presentation is initialized ...
*/
.impress-enabled .hint { display: block }
/*
... and we will show it when the first step (with id 'bored') is active.
*/
.impress-on-bored .hint {
/*
We remove the transparency and position the hint in its default fixed
position.
*/
opacity: 1;
-webkit-transform: translateY(0px);
-moz-transform: translateY(0px);
-ms-transform: translateY(0px);
-o-transform: translateY(0px);
transform: translateY(0px);
/*
Now for fade in transition we have the oposite situation from the one
above.
First after 4.5s delay we animate the transform property to move the hint
into its correct position and after that we fade it in with opacity
transition.
*/
-webkit-transition: opacity 1s 5s, -webkit-transform 0.5s 4.5s;
-moz-transition: opacity 1s 5s, -moz-transform 0.5s 4.5s;
-ms-transition: opacity 1s 5s, -ms-transform 0.5s 4.5s;
-o-transition: opacity 1s 5s, -o-transform 0.5s 4.5s;
transition: opacity 1s 5s, transform 0.5s 4.5s;
}
/*
And as the last thing there is a workaround for quite strange bug.
It happens a lot in Chrome. I don't remember if I've seen it in Firefox.
Sometimes the element positioned in 3D (especially when it's moved back
along Z axis) is not clickable, because it falls 'behind' the <body>
element.
To prevent this, I decided to make <body> non clickable by setting
pointer-events property to `none` value.
Value if this property is inherited, so to make everything else clickable
I bring it back on the #impress element.
If you want to know more about `pointer-events` here are some docs:
https://developer.mozilla.org/en/CSS/pointer-events
There is one very important thing to notice about this workaround - it makes
everything 'unclickable' except what's in #impress element.
So use it wisely ... or don't use at all.
*/
.impress-enabled { pointer-events: none }
.impress-enabled #impress { pointer-events: auto }
/*
There is one funny thing I just realized.
Thanks to this workaround above everything except #impress element is invisible
for click events. That means that the hint element is also not clickable.
So basically all of this transforms and delayed transitions trickery was probably
not needed at all...
But it was fun to learn about it, wasn't it?
*/
/*
That's all I have for you in this file.
Thanks for reading. I hope you enjoyed it at least as much as I enjoyed writing it
for you.
*/