.checkout-login-panel .site-login.has-register {
    margin: 0;
}

.checkout-login-panel .site-login.has-register > .site-login-container {
    width: 100%;
    max-width: 600px;
}

.checkout-login-panel .site-login.has-register > .site-login-container  .site-login-overflow {
    border-radius: 15px !important;
}

.form-row-first {
    width: 50% !important;
    flex: 1 1 50% !important;
    max-width: 50% !important;
    display: inline-flex;
}

.form-row-3 {
    max-width: 33%;
    flex: 3 3 33% !important;
}