style.css

/* Extra small devices (phones, 768px and down) */
@media only screen and (max-width: 768px) {
    #inputmask {
        height: 400px !important;
    }
}

/* Small devices (portrait tablets and large phones, 768px and up) */
@media only screen and (min-width: 768px) {

}

/* Medium devices (landscape tablets, 992px and up) */
@media only screen and (min-width: 992px) {
    #inputmask {
        height: 300px !important;
    }
}

/* Large devices (laptops/desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
    #inputmask {
        height: 400px !important;
    }
}

/* Extra large devices (large laptops and desktops, 1400px and up) */
@media only screen and (min-width: 1400px) {
    #inputmask {
        height: 400px !important;
    }
}