view: prevent scrolling navigation elements

scrolling on navigation moved the whole view up, this change
prevents nav from being scrollable.

src/styles/main.css

@@ -106,9 +106,10 @@ body {
 }
 
 html, body {
-  min-height: 100%;
   height: 100%;
   margin: 0;
+  min-height: 100%;
+  overflow: clip;
 }
 
 h1, h2, h3, h4, h5 { font-weight: normal; }