@media only screen and (max-width: 480px), only screen and (max-device-width: 480px) {

body {
        background-color: black;
        color: white;
        width: 400px;
        margin: 0 auto;
        font-size: 4em;
        text-align: center;
}

a {
        text-decoration: none;
        color: white;
}

}