Fixes scroll problem with touch input

sass/base.scss

@@ -9,9 +9,8 @@
           box-sizing: border-box;
 }
 
-// We fix position the body and scroll `.content`.
 body {
-  position: fixed;
+  position: absolute;
   top: 0;
   right: 0;
   bottom: 0;
@@ -36,12 +35,13 @@ a {
 
 // Wrapper to be used around all content not in .bar-title and .bar-tab
 .content {
-  position: absolute;
+  position: relative;
   top: 0;
   right: 0;
   bottom: 0;
   left: 0;
   overflow: auto;
+  overflow-y: scroll;
   background-color: #fff;
   -webkit-overflow-scrolling: touch;
 }