body {
    background: url("../img/avatr.png") no-repeat center top fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
    -o-background-size: cover;
    padding-top: 506px;
}

#start-purchase-btn {
    margin-top: -150px;
    margin-left: 270px;
    background-color: #23364e;
    border-color: #23364e;
    color: white;
}

#start-purchase-link {
    text-decoration: none;
    color: white;
}