Merge pull request #3009 from hypothesis/3007-fix-tags-autocomplete-dropdown-css

Fix tags autocomplete dropdown CSS

h/static/styles/annotation.scss

@@ -17,6 +17,7 @@ $annotation-card-left-padding: 10px;
 }
 
 .annotation {
+  display: block;
   font-family: $sans-font-family;
   font-weight: 300;
   position: relative;