.wm-dropdown-multiselect-wrapper ul {
    background-color: #fff;
    color: #000;
    list-style: none;
    padding: 0;
    box-shadow: 0 2px 5px 0 rgba(0,0,0,.16),0 2px 10px 0 rgba(0,0,0,.12);
    min-width: 250px;
    width: auto;
    position: fixed;
    margin-top: 3px;
    z-index: 100;

    max-height: 300px;
    overflow: auto;

}

.wm-dropdown-multiselect-wrapper ul li {
    padding: 5px;
}
.wm-dropdown-multiselect-wrapper ul li .custom-control-input {
    opacity: 1;
}

.wm-dropdown-multiselect-wrapper ul li:hover {
    padding: 5px;
    background-color: #ddd;
}

.wm-dropdown-multiselect-wrapper ul li[aria-selected=true] {
    background-color: #ddd
}

.wm-dropdown-multiselect-wrapper .dropdown-separator {
    border-bottom: 1px solid #3c3c3c;
    margin-top: .2em;
}