Minor UI improvements

assets/sass/style.sass

@@ -55,7 +55,7 @@ nav
           padding: 4px 16px
           border-radius: 2px
           box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1)
-          &:hover
+          &:hover,&:focus
             background: #FFD54F
             box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2)
 
@@ -112,7 +112,7 @@ form.upload
     width: 160px
     background: #333333
     border-radius: 2px
-    &:hover
+    &:hover,&:focus
       margin-top: 4px
       box-shadow: 0 4px 6px rgba(0, 0, 0, 0.4)
     .image-container