.advanced-search-form {
    position: absolute;
    background: #fff;
    padding: 20px;
    width: 100%;
    top: calc(100% + 10px);
    border: 1px solid #ccc;
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}