.sderf-newsletter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 5%;
}
.sderf-newsletter-form input[type="email"] {
    flex: 1 1 65%;
    max-width: 65%;
}
.sderf-newsletter-form button {
    flex: 1 1 30%;
    max-width: 30%;
    background-color: #6620A0;
    color: #FFFFFF;
    border: none;
    cursor: pointer;
}