#mainNav .li1{position:relative;}
#mainNav .li1 .subNav{display:none;position:absolute;width: 100%;background: #0d67bb;left: 0;top: 50px;}
#mainNav .li1:hover .subNav{display:block;}
#mainNav .li1 .subNav a{line-height: 25px; padding: 8px 0px;}
#mainNav .li1 .subNav a:hover{background:#f9f9f9;}