Tidying up styling

site/public/css/style.css

-.box{
-    float:left;
-    margin-right:20px;
-}
-.clear{
-    clear:both;
-}
-
-.centre {
-  margin: auto;
-  width: 50%;
-  border: 3px solid black;
-  padding: 10px;
-  text-align:center;
-}
-
 .btn-link {
     border: none;
     outline: none;