Initiate design system and refactor login page buttons.

frontend/src/app/components/publications-search-bar/publications-search-bar.component.scss

@@ -24,9 +24,10 @@
             border-radius: $borderRadiusValue;
             background-color: white;
             border: none;
-            top: .4em;
+            top: 0;
             right: 0;
             color: #aaaaaa;
+            padding: .4em;
     
             &:hover {
                 background-color: #eee;