.left_top {
    width: 100%;
    height: 36px;
    line-height: 36px;
    float: left;
    background: #f27b09;
}
#right_top {
    width: 100%;
    height: 36px;
    line-height: 36px;
    float: left;
	background: #1f283e;
    color: #fff;
}

.bb_nav ul li a:hover {
    background-color: #f27b09;
	font-weight:bold;
}