@media screen and (min-width: 900px), print {
    div.sign {
        margin-left: 10em;
    }
    div.notice {
        font-size: 16px;
        padding-left: 1em
    }
}
@media screen and (max-width: 899px) {
    div.sign {
        width : 100%;
        margin-left: 10px;
    }
    div.notice {
        font-size: 16px;
        padding-left: 1em
    }
}