Fix CodeMirror scrolling.

Author: sebadoom

stylus/app.styl

@@ -535,7 +535,6 @@ body
 
       .input
         padding 10px
-        overflow scroll
         +breakpoint("tablet")
           padding 20px
           // &[data-alg="HS256"]

stylus/codemirror.styl

@@ -2,11 +2,17 @@
   zoom 1
   font-family 'Roboto Mono', Menlo
   outline none
-  height auto
+  height 100%
   *
     outline none
     box-shadow none
 
+.CodeMirror-scroll
+  overflow hidden !important
+  margin-bottom 0
+  margin-right 0
+  padding-bottom 0
+
 .jwt-playground .input
   &.error
     background pink