add underline mixin

Author: alexandersandberg

assets/stylesheets/new-stylesheets/_helpers.scss

@@ -194,3 +194,9 @@
     white-space: normal;
   }
 }
+
+@mixin underline {
+  text-decoration: underline;
+  text-decoration-color: rgba(255, 255, 255, 0.5);
+  text-underline-offset: 2px;
+}

assets/stylesheets/new-stylesheets/includes/callout/_base.scss

@@ -37,9 +37,7 @@
       @include link-with-right-arrow();
       display: block;
       color: white;
-      text-decoration: underline;
-      text-decoration-color: rgba(255, 255, 255, 0.5);
-      text-underline-offset: 2px;
+      @include underline;
       margin-top: 14px;
 
       i {