markdown fixes

src/scss/demo/_highlight.scss

@@ -11,7 +11,6 @@ pre.highlight,
   max-height: 30rem;
   margin: 1.5rem 0;
   overflow: auto;
-  font-size: $code-font-size;
   border-radius: $border-radius;
   @include scrollbar;
 }

src/scss/ui/_dropdowns.scss

@@ -63,6 +63,7 @@
 
 .dropdown-menu-columns {
   display: flex;
+  flex: 0 .25rem;
 }
 
 .dropdown-menu-arrow {

src/scss/ui/_markdown.scss

@@ -2,6 +2,7 @@
 Markdown
  */
 .markdown {
+  font-size: 1rem;
   line-height: $line-height-lg;
 
   > :first-child {

src/scss/ui/_type.scss

@@ -105,7 +105,7 @@ code {
 pre {
   padding: 1rem;
   overflow: auto;
-  font-size: $code-font-size;
+  font-size: $h5-font-size;;
   hyphens: none;
   line-height: $code-line-height;
   tab-size: 3;