menu.css

.dropdown > a {
    color: #586069 !important;
    border-style: solid;
    border-color: transparent;
    border-width: 1px 1px 0 1px;
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}
.dropdown > a:hover,
.dropdown.open > a {
    color: #586069 !important;
}
.dropdown.open > a {
    border-color: #e1e4e8 !important;
    background-color: #f6f8fa !important;
    z-index: 10000;
}

.dropdown > .dropdown-menu {
    margin-top: -1px !important;
    border-top-left-radius: 0 !important;
    border-top-right-radius: 3px !important;
}
.dropdown-menu {
    box-shadow: none;
    border: solid 1px #e1e4e8;
    background-color: #f6f8fa;
    border-radius: 3px;
    padding: 8px 0;
    font-size: 1em;
}
.dropdown-menu > .disabled > a {
    color: rgba(0,0,0,0.3);
}
.dropdown-menu > li > a {
    height: 32px;
    line-height: 32px;
    color: #586069;
    display: block;
    padding: 0 24px;
}
.dropdown-submenu > a {
    position: relative;
}
.dropdown-submenu > a::after {
    position: absolute;
    top: 7px;
    right: 16px;
    opacity: 0.87;
}
.dropdown-menu > li > a:hover {
    color: #586069;
    background-color: #eaecee;
}
.dropdown-menu .divider {
    margin: 8px 0;
    background-color: #e1e4e8;
}