mobile button styles

public/resources/css/module/_side-nav.scss

@@ -58,6 +58,13 @@
       background: darken($tin, 5%);
       color: $snow;
       padding-right: $unit * 4;
+      display: none;
+
+      @media handheld and (max-width: $phone-breakpoint),
+      screen and (max-device-width: $phone-breakpoint),
+      screen and (max-width: $tablet-breakpoint) {
+        display: inline-block;
+      }
 
       .icon {
         position: absolute;