.check-ok:before, .check-wrong:before {
    font-size: 2rem;
    position: absolute;
    right: 10px;
    font-size: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.check-ok:before {
    color: #2ecc71;
}

.check-wrong:before {
    color: #e74c3c;
}