body, html {
    margin: 0;
    padding: 0;
    height: 100%;
}

.full-viewport {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    position: relative;
}

.imagen1 {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
}

.imagen2 {
    display: none;
}

.imagen3 {
    display: none;
}

@media (max-width: 1000px) {
    .imagen1 {
        display: none;
    }

    .imagen2 {
        width: 100%;
        height: 100%;
        max-width: 100%;
        max-height: 100%;
        object-fit: cover;
        position: absolute;
        top: 0;
        left: 0;
        display: block;
    }

    .imagen3 {
        display: none;
    }
}
@media (max-width: 650px) {
    .imagen1 {
        display: none;
    }

    .imagen2 {
        display: none;
    }

    .imagen3 {
        width: 100%;
        height: 100%;
        max-width: 100%;
        max-height: 100%;
        object-fit: cover;
        position: absolute;
        top: 0;
        left: 0;
        display: block;
    }
}