.menu-block-env_mega_menu > ul {padding:0;}
.menu-block-env_mega_menu > ul > li {position:relative;}
.menu-block-env_mega_menu > ul > li > ul {
  width:600px;
  position:absolute;
  top:53px;
  left:-9999px;
  z-index:100;
}
.menu-block-env_mega_menu > ul > li.hover > ul {left:0;}