Update CSS to correct section targets

so section when navigated to directly are
displayed properly below the header

source/mahara/static/mahara.css_t

@@ -471,11 +471,11 @@ a.incognito:hover {
   top: 0;
 } 
 
-.section::before {
+.section:target:before {
   content: '';
   display: block;
-  height: 120px
-  margin-top: -120px;
+  height: 90px;
+  margin-top: -90px;
   visibility: hidden;
 }
 /* -- Buttons --------------------------------------------------------------- */