Base font size added.

lib/sass/bars.scss

@@ -103,16 +103,9 @@
           box-flex: 1;
 }
 
-// Icon for tab
-.tab-icon {
-  display: block;
-  height: 18px;
-  margin: 0 auto;
-}
-
 // Label for tab
 .tab-label {
-  margin-top: 1px;
+  margin-top: -2px;
   font-size: 11px;
   font-weight: 400;
   color: $default-color;

lib/sass/ratchicons.scss

@@ -15,6 +15,7 @@
 .icon {
   display: inline-block;
   font-family: "Ratchicons", sans-serif;
+  font-size: 24px;
   text-decoration: none;
   line-height: 1;
   cursor: default;