Tweak docs header on small viewports

Author: weavejester

docs/style.css

@@ -126,13 +126,14 @@ body {
 
   #header {
     width: 100%;
-    height: 44px;
+    height: 48px;
     border-right: none;
+    border-bottom: 1px solid #14161a;
   }
 
   #header h1 {
     background-size: 24px;
-    background-position: 8px 10px;
+    background-position: 8px 11px;
     font-size: 32px;
     margin: 0;
     padding: 0;
@@ -174,7 +175,7 @@ body {
   }
 
   #content {
-    margin-top: 52px;
+    margin-top: 54px;
   }
 
   pre.highlight code {