.list-he-thong ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.list-he-thong ul li a {
    display: block;
    text-decoration: none;
    padding: 10px 20px;
    color: #2f2f2f;
}

.list-he-thong ul li {}

.list-he-thong {
    border: 1px solid #E8E8E8;
}

.list-he-thong ul li a.active,
.list-he-thong ul li a:hover {
    background: #b20a09;
    color: #ffffff;
    font-weight: bold;
}

.list-he-thong .ae-select {
    display: none;
}

.list-he-thong .ae-select {
    padding: 10px 20px;
    background: #b20a09;
    color: #ffffff;
    font-weight: bold;
    position: relative;
}

.list-he-thong .down-icon {
    position: absolute;
    right: 15px;
    top: 60%;
    transform: translateY(-50%);
    display: block;
}

@media screen and (max-width: 992px) {
    .list-he-thong {
        margin-bottom: 20px;
    }

    .list-he-thong .ae-select {
        display: block;
    }

    .list-he-thong ul {
        display: none;
        height: 0px;
        overflow: hidden;
        -webkit-transition: height .5s ease .1s;
        -o-transition: height .5s ease .1s;
        transition: height .5s ease .1s;
    }

    ul.ae-select-ul.active {
        display: block;
        height: auto;
    }
}