CouponCodeInput.css

div + .quiqqer-coupons-field {
    margin-left: 20px;
}

.quiqqer-coupons-couponcodeinput {
    background: rgba(0, 0, 0, 0.05);
    display: flex;
    padding: 5px;
}

.quiqqer-coupons-couponcodeinput-input {
    min-width: 220px;
}

.quiqqer-coupons-couponcodeinput-title,
.quiqqer-coupons-couponcodeinput-input {
    margin-right: 1rem;
}

.quiqqer-coupons-couponcodeinput input {
    line-height: 36px;
    margin-right: 1rem;
}

.quiqqer-coupons-remove {
    margin-left: 1rem;
}

.quiqqer-coupons-remove .fa {
    margin-right: 0;
}

/**
 * Simple Checkout
 */

.quiqqer-coupons-field-simpleCheckout {
    margin-top: 20px;
    margin-left: 0 !important;
}

.quiqqer-coupons-field-simpleCheckout .quiqqer-coupons-couponcodeinput {
    background: var(--_sectionBgColor);
    display: flex;
    padding: var(--_sectionPadding);
}

.quiqqer-coupons-field-simpleCheckout .quiqqer-coupons-couponcodeinput label {
    flex-grow: 1;
}

.quiqqer-coupons-field-simpleCheckout .quiqqer-coupons-couponcodeinput-input {
    width: calc(100% - 1rem);
}