hide horizontal scrollbar on mobile

assets/css/main.scss

@@ -30,6 +30,8 @@ $code: Menlo,Monaco,"Courier New",monospace;
 html,
 body {
   height: 100%;
+  width: 100%;
+  overflow-x: hidden;
 }
 
 html {
@@ -492,4 +494,4 @@ footer {
 
 // BREAKPOINTS
 @import "partials/_breakpoints";
-@import "custom";
+@import "custom";