UX: A couple of small fixes (#21)

common/common.scss

@@ -4,7 +4,6 @@ $padding-basis: 0.75em;
   display: none;
   width: 225px;
   border-left: 1px solid var(--primary-low);
-  padding-bottom: 0.5em;
   box-sizing: border-box;
   a {
     display: block;
@@ -15,7 +14,8 @@ $padding-basis: 0.75em;
     }
   }
   #d-toc {
-    max-height: calc(100vh - 3em - var(--header-offset));
+    max-height: calc(100vh - 4.5em - var(--header-offset));
+    padding-bottom: 0.5em;
     overflow: auto;
     ul {
       list-style-type: none;

javascripts/discourse/connectors/after-topic-progress/d-toc-mini.hbs

@@ -1,3 +1,5 @@
-<a {{action "showTOCOverlay"}} href class="btn btn-primary">
-  {{theme-i18n "table_of_contents"}}
-</a>
+{{d-button
+  class="btn-primary"
+  action=(action "showTOCOverlay")
+  label=(theme-prefix "table_of_contents")
+}}