a.btn.btn-primary.pte-login {
    margin-bottom: 20px;
}

.pte-login::before {
    content: "";
    width: 50px;
    height: 17px;
    display: inline-block;
    vertical-align: text-bottom;
    line-height: 20px;
    margin-right: 5px;
    background-size: 100% auto;
    background: url(pteid.png) no-repeat center;
}