input[type="email"].sib-email-area {
    width: 50% !important;
    box-sizing: border-box;
    padding: 12px 16px;
    border-radius: 14px;
}

@media screen and (max-width:480px) {
    input[type="email"].sib-email-area {
        width: 100% !important;
    }
}