body {
    display:flex;
    justify-content:center;
    align-items:center;
    height:100vh;
    background-color:white;
}
.myDiv {
    width:200px;
    height:50px;
    background-color:#000;
    color:#fff;
    text-align: center;
    line-height: 50px;;
    font-size:20px;
    font-weight:bold;
    cursor:pointer;
}