@media (orientation: portrait) {
    body {
        font-size: 18px;
    }

    form {
        margin: 0 auto;
        padding: 10px;
    }

    form span.test {
        display: block;
        text-align: center;
        margin: 0 auto;
    }

    #answer {
        font-size: 18px;
        width: 40px;
    }

    #submit {
        display: block;
        margin: 10px auto 0 auto;
        padding: 5px 15px;
        font-size: 18px;
    }

    #is-correct {
        margin-top: 20px;
    }
}

/*
 * TODO: this is probably a wash, since so much of the screen is taken up
 * by the keyboard that there's basically nothing visible anyway.
 * -bjc (2014-May-21)
 */
@media (orientation: landscape) {
    body {
       font-size: 12px;
    }

    form {
        margin: 0 auto;
        padding: 5px;
    }

    form span.test {
        text-align: center;
        margin: 0 auto;
    }

    #answer {
        font-size: 12px;
        width: 40px;
    }

    #submit {
        padding: 5px 15px;
        font-size: 12px;
    }

    #is-correct {
        margin-top: 10px;
    }
}