.en_signup_form .en_signup_inline {
    display: flex;
    flex-wrap: nowrap;
    align-items: flex-end;
    gap: 0.5em;
}

.en_signup_form .en_signup_inline > label {
    flex: 1 1 0;
    min-width: 0;
    margin: 0;
}

.en_signup_form .en_signup_inline input[type="email"] {
    display: block;
    box-sizing: border-box;
    width: 100%;
    min-width: 0;
    margin: 0;
}

.en_signup_form .en_signup_inline > input[type="submit"] {
    flex: 0 0 auto;
    width: auto;
    margin: 0;
}