@media only screen and (max-width: 1000px) {
    .form{
        margin: 50px auto;
        padding: 40px 20px;
        width: 90%;
    }
    .tarjetas img {
        height: unset;
        width: 100%;
        max-width:30px;
    }

    h2{
        font-size: 1.5rem;
    }

    h3{
        font-size: 1.3rem;
        margin-left: unset;
        width: 100%;
    }
}