.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1000;
    display: none;
    float: left;
    min-width: 160px;
    padding: 5px 0;
    margin: 2px 0 0;
    font-size: 1rem;
    list-style: none;
    background-color: #fff;
    border: 1px solid #ccc;
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 4px;
    -webkit-box-shadow: 0 6px 12px rgba(0,0,0,0.175);
    box-shadow: 0 6px 12px rgba(0,0,0,0.175);
    background-clip: padding-box;
}