Fix weird 1px content issue with display: table in chrome on modal, #787

src/definitions/modules/modal.less

@@ -103,7 +103,6 @@
 ---------------*/
 
 .ui.modal > .content {
-  position: relative;
   display: table;
   table-layout: fixed;
   width: 100%;

src/themes/packages/default/modules/modal.variables

@@ -2,7 +2,7 @@
              Modal
 *******************************/
 
-@background: transparent;
+@background: @white;
 @border: none;
 @width: 90%;
 @xOffset: -(@width / 2);