No borders around circles.

public/css/app.css

@@ -4659,7 +4659,6 @@ button.close {
     float: left;
     margin-right: 1em;
     background: #eeeeee;
-    border: 1px solid #d5d5d5;
     border-radius: 50%;
     font: bold 2em monospace;
     text-align: center;

resources/assets/sass/pages/_welcome.scss

@@ -49,7 +49,6 @@
         float: left;
         margin-right: 1em;
         background: $gray-lighter;
-        border: 1px solid darken($gray-lighter, 10%);
         border-radius: 50%;
         font: bold 2em monospace;
         text-align: center;