Removed unnecessary nesting from _base.scss

lib/site_template/_sass/_base.scss

@@ -177,13 +177,10 @@ pre {
 /**
  * Clearfix
  */
-%clearfix {
-
-    &:after {
-        content: "";
-        display: table;
-        clear: both;
-    }
+%clearfix:after {
+    content: "";
+    display: table;
+    clear: both;
 }
 
 
@@ -191,16 +188,13 @@ pre {
 /**
  * Icons
  */
-.icon {
+.icon > svg {
+    display: inline-block;
+    width: 16px;
+    height: 16px;
+    vertical-align: middle;
 
-    > svg {
-        display: inline-block;
-        width: 16px;
-        height: 16px;
-        vertical-align: middle;
-
-        path {
-            fill: $grey-color;
-        }
+    path {
+        fill: $grey-color;
     }
 }