When the mouse points up, the page slowly pulls down. How to do this?

Question

.nav-item:hover .mi_phone{    display: block;}
/*下拉*/

.mi_phone{    margin-top: 40px;    border-top: 1px solid #aaa;    box-shadow: 0px 3px 10px 0px #909090;    height: 230px;    width: 200%;    position: absolute;    background: #fff;    z-index: 22;    left: -300px;    display: none;}