font tweaks

wagtail/wagtailadmin/static/wagtailadmin/scss/components/messages.scss

@@ -21,6 +21,8 @@
         margin-right:0.5em;
         font-size:1.5em;
         vertical-align:middle;
+        -webkit-font-smoothing: antialiased;
+        -moz-osx-font-smoothing: grayscale;
     }
 
     .error{

wagtail/wagtailadmin/static/wagtailadmin/scss/core.scss

@@ -219,6 +219,7 @@ img{
             text-shadow:-1px -1px 0px rgba(0,0,0,0.3);
 
             &:before{
+                vertical-align:-20%;
                 margin-right:0.5em;
             }
             &:hover{