body .contentholder {
    max-width: 30vw;
}

@media only screen and (max-width: 1024px) {
    body .contentholder {
        max-width: 50vw;
    }
}

@media only screen and (max-width: 768px) {
    body .contentholder {
        max-width: 70vw;
    }
}

@media only screen and (max-width: 480px) {
    body .contentholder {
        max-width: 90vw;
    }
}