body {
    font-family: Arial, Helvetica, sans-serif;
}

#main {
    width: 80%;
    max-width: 768px;
    margin: 0 auto;
    text-align: center;
}

.button {
    display: block;
    width: 160px;
    margin: 20px auto;
    padding: 12px 24px;
    border-radius: 4px;
    background: #5e5e5e;
    color: #fff;
    font-weight: bold;
    text-decoration: none;
    text-align: center;
}

    .button:hover {        
        background: #9b9b9b;
    }