a {
    text-decoration: none;
}
.writing-mode {
    text-align: center;
    cursor: default;
}
.div-menu {
    position: relative;
    width: 300px;
    margin: 0 auto;
    background-color: #bdbdbd;
    overflow: hidden;
}
.div-menu:hover .div-submenu{
    transform: translatey(0);
}
.div-menu:hover {
    transition: width 0.3s, height 0.3s;
    height: 300px;
}
.div-menu:hover .writing-mode {
    display: none;
}
.div-submenu {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: translatey(100%);
    transition: transform 500ms ease-in-out;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
}
.submenu-item {
}