tweak: dropdown styles

lib/default-theme/DropdownLink.vue

@@ -57,7 +57,7 @@ export default {
       display inline-block
       vertical-align middle
       margin-top -1px
-      margin-left 6px
+      margin-left 0.4rem
       width 0
       height 0
       border-left 4px solid transparent
@@ -94,11 +94,11 @@ export default {
             width 0
             height 0
             border-left 5px solid $accentColor
-            border-top 4px solid transparent
-            border-bottom 4px solid transparent
+            border-top 3px solid transparent
+            border-bottom 3px solid transparent
             position absolute
-            top calc(50% - 3px)
-            left 10px
+            top calc(50% - 2px)
+            left 9px
       &:first-child h4
         margin-top 0
         padding-top 0