Reduce font-size for 'home of plots' in md

Closes #70

uhepp-js/src/common.scss

@@ -115,6 +115,10 @@ body {
   }
 }
 
+
+.plot-background h2 {
+  font-size: 1.5rem;
+}
 @include media-breakpoint-up(md) { 
   .plot-background {
     background-image: url('/static/uhepp_vault/background.png');
@@ -129,6 +133,9 @@ body {
     background-repeat: no-repeat;
     background-position: 80% 100%;
     background-size: contain;
+    h2 {
+      font-size: 2rem;
+    }
   }
 }