.btn-hidrogeno{
    background-color: var(--mme-green);
    color: white;
    border-radius: 15px;
    border: 5px solid white;
    text-align: center;
    text-decoration: none;
    transition: 0.5s ease-out;
}

.btn-hidrogeno:hover {
    background-color: #3366cc;
    color: #FFF;
}