.city_container {
    background: white;
    width: 280px;
    height: 500px;
    position: fixed;
    top: -100%;
    display: none;
    right: 0;
    left: 0;
    margin: auto;
    padding: 20px;
    border-radius: 5px;
    font-size: 16px;
    line-height: 1.5;
    box-shadow: 0px 0px 20px 0px black;
    transition: 500ms ease;
    overflow: auto;
}
.city_container_active {
    top: 50px;
    display: block;
}