Use button for controls in header

public/index.html

@@ -89,6 +89,11 @@
          max-width: 480px;
      }
 
+     section.login label {
+         padding: 6px 0;
+         margin: 6px 0;
+     }
+
      section.posts .controls {
          padding: 0 0 36px;
      }
@@ -132,6 +137,7 @@
          cursor: pointer;
          text-decoration: none;
          display: inline-block;
+         border: none;
      }
 
      section.posts ul.results {