/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
    #res-3d {
        font-size: 3rem;
    }

    .item-video {
        height: 180px;
    }
}

/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
    #res-3d {
        font-size: 2rem;
    }

    .item-video {
        height: 180px;
    }
}

/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
    #res-3d {
        font-size: 3rem;
    }

    .item-video {
        height: 243px;
    }
}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
    #res-3d {
        font-size: 5rem;
    }

    .item-video {
        height: 327px;
    }
}

/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
    #res-3d {
        font-size: 5rem;
    }

    .item-video {
        height: 390px;
    }
}