lumen: fix add-on button heights, closes #227

lumen/bootstrap.css

@@ -5703,6 +5703,7 @@ button.close {
   border-width: 0 1px 4px 1px;
 }
 .btn {
+  padding: 8px 12px 7px;
   border-width: 0 1px 4px 1px;
   font-size: 12px;
   font-weight: bold;
@@ -5718,6 +5719,19 @@ button.close {
   -webkit-box-shadow: none;
   box-shadow: none;
 }
+.btn-lg,
+.btn-group-lg > .btn {
+  padding: 14px 16px 13px;
+  line-height: 15px;
+}
+.btn-sm,
+.btn-group-sm > .btn {
+  padding: 4px 10px;
+}
+.btn-xs,
+.btn-group-xs > .btn {
+  padding: 1px 5px;
+}
 .btn-default:hover,
 .btn-default:focus,
 .btn-group.open .dropdown-toggle.btn-default {

lumen/bootswatch.less

@@ -17,6 +17,7 @@
 // Buttons ====================================================================
 
 .btn {
+  padding: 8px @padding-base-horizontal 7px;
   .shadow();
   font-size: 12px;
   font-weight: bold;
@@ -33,6 +34,22 @@
     .box-shadow(none);
   }
 
+  &-lg,
+  &-group-lg > .btn {
+    padding: 14px @padding-large-horizontal 13px;
+    line-height: 15px;
+  }
+
+  &-sm,
+  &-group-sm > .btn {
+    padding: 4px @padding-small-horizontal;
+  }
+
+  &-xs,
+  &-group-xs > .btn {
+    padding: @padding-xs-vertical @padding-xs-horizontal;
+  }
+
   &-default:hover,
   &-default:focus,
   &-group.open .dropdown-toggle.btn-default {