Resemble.js/demoassets/resemble.css

h1 {
    text-align: center;
}

body {
    padding-top: 60px;
}

footer {
    margin-top: 45px;
    padding: 35px 0 36px;
    border-top: 1px solid #e5e5e5;
}

.drop-zone {
    border: 10px dashed #ccc;
    color: #ccc;
    font-size: 32px;
    height: 400px;
    line-height: 400px;
    text-align: center;
    width: 400px;
    overflow: hidden;
    position: relative;
}

.drop-zone.drag-over {
    border: 10px dashed #08c;
}

.drop-zone img {
    width: 400px;
    position: absolute;
    top: 0;
    left: 0;
}

.small-drop-zone {
    margin-top: 20px;
    margin-left: 90px;
    border: 10px dashed #ccc;
    color: #ccc;
    font-size: 32px;
    height: 330px;
    line-height: 330px;
    text-align: center;
    width: 330px;
    overflow: hidden;
    position: relative;
}

.small-drop-zone.drag-over {
    border: 10px dashed #08c;
}

.small-drop-zone img {
    width: 330px;
    position: absolute;
    top: 0;
    left: 0;
}

#image-diff {
    margin-left: 0;
    margin-top: 50px;
    border-style: solid;
}

.progress #alpha {
    background-color: #eee;
    background-image: linear-gradient(45deg, darkgrey 25%, transparent 25%, transparent 75%, darkgrey 75%, darkgrey),
    linear-gradient(45deg, darkgrey 25%, lightgrey 25%, lightgrey 75%, darkgrey 75%, darkgrey);
    background-size: 14px 14px;
    background-position: 0 0, 7px 7px;
    background-repeat: repeat;
}

.progress #white {
    background-color: #fff;
    background-image: -moz-linear-gradient(top, #fff, #ddd);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#fff), to(#ddd));
    background-image: -webkit-linear-gradient(top, #fff, #ddd);
    background-image: -o-linear-gradient(top, #fff, #ddd);
    background-image: linear-gradient(to bottom, #fff, #ddd);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#ffdddddd', GradientType=0)
}

.progress #black {
    background-color: #000;
    background-image: -moz-linear-gradient(top, #555, #000);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#555), to(#000));
    background-image: -webkit-linear-gradient(top, #555, #000);
    background-image: -o-linear-gradient(top, #555, #000);
    background-image: linear-gradient(to bottom, #555, #000);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff555555', endColorstr='#ff000000', GradientType=0)
}