B2主题顶部导航条的下拉菜单美化

b2主题顶部导航条和子导航固定成58px了，改为75px了，并且把下拉菜单也美化了下，保留了导航条滚动后的效果。

具体效果图可以看下图。

把以下代码 放主題或者子主題style.css中

/*
* 导航条美化
*/
.header-banner { /*隐藏顶部bar*/
display: none!important;
}
.site-header {
height: 75px;
margin: 0;
}
.header {
height: 75px;
}
.header .wrapper {
height: 100%;
}
.site-header-in {
box-shadow: none!important;
z-index: 10;
}
.site.up .site-header-in {
transform: translate(0,-75px);
transition: transform .3s;
}
.site .site-header-in {
transition: transform .3s;
}
.header .top-style {
height: 100%;
}
.top-style-blur { /*导航条背景颜色*/
background: #206aff;
}
.top-menu ul li.depth-0 > a {
color: #fff;
padding: 18px 30px;
}
.hob { /*去掉底部下划线*/
display: none!important;
}
.user-tools { /*隐藏顶部用户头像原点*/
background: transparent;
}
/*
* 导航条子菜单下拉美化
*/
.has_children .sub-menu {
border-radius: 4px;
}
.top-menu .b2-jt-down {
display: none!important;
}
.top-menu-ul .sub-menu-0 {
border-top: 0;
padding: 15px;
transform: translateY(10px);
transition: all .3s;
}
.top-menu ul li {}
.top-menu ul li:hover .sub-menu-0 {
transform: translateY(0);
}
.top-menu-ul .sub-menu-0>li {
border-left: 1px solid #ebeef5;
position: relative;
}
.b2-menu-3 .sub-menu-0>li>a {
color: #4c4c4c;
padding: 8px 15px;
white-space:nowrap;
overflow:hidden;
text-overflow:ellipsis;
}
.b2-menu-3 .sub-menu-0>li:after {
content: '';
position: absolute;
top: 12px;
left: -5px;
width: 3px;
height: 3px;
border-radius: 50%;
background: #fff;
border: 3px solid #3d7eff;
}
.b2-menu-3 .sub-menu-0>li:nth-child(2n+1):after{
border: 3px solid #f1787f;
}
.b2-menu-3 .sub-menu-0>li:nth-child(3n+1):after{
border: 3px solid #61e1b9
}
.b2-menu-3 .sub-menu-0>li>a:hover {
background: #ebeef5;
}
.b2-menu-3 .sub-menu-0 > li:hover > a, .b2-menu-3 .sub-menu-0 a:hover {
color: #333;
}
.top-user-info .top-user-box {
width: 30px;
height: 30px;
}
.top-user-avatar img {
border: 3px solid rgba(255, 255, 255, 0.6);
border-radius: 50%!important;
background: transparent;
}
.header-login-button button {
background: #377aff;
}
.header-login-button .empty {
color: #fff;
}