.box{

    background-color: #ffffff;

    border: 1px solid #ddd;

    border-radius: 20px;

    padding: 20px;

    margin: 10px auto;

    max-width: 100vw;;

    width: calc(100% - 5px);

    box-shadow: 0 2px 4px rgba(0,0,0,0.1);

    box-sizing: border-box;

    position: relative;

    text-align: center;

    z-index: 1;

}