style improvements

resources/public/styles/main.less

@@ -24,13 +24,12 @@
 .central-element {
   @media screen and (min-width: 1024px) {
     width: @width;
-    margin-left: auto;
-    margin-right: auto;
   }
   @media screen and (max-width: 1023px) {
-    margin-left: 1em;
+    width: 90%;
-    margin-right: 1em;
   }
+  margin-left: auto;
+  margin-right: auto;
 }
 .thin-border {
   border: 1px solid @foreground;
@@ -91,6 +90,7 @@ a:visited {
   .helvetica;
   width: 100%;
   font-size: 0.8em;
+  padding-bottom: 2em;
   text-align: center;
   @media screen and (max-width: 767px) {
     font-size: 0.4em;