@charset"UTF-8";
.back{
    border: 1px solid #000;
    width: 11em;
    margin: 0 auto;
    text-align: center;
    margin-top: 1em;
}
.back a{
    padding: 5px 10px;
    text-decoration: none;
    display: block;
    background-color: brown;
    color:white;
}