body {
    font-size: calc(18px + 0.1vw);
    padding: 0;
    width: 61.8%;
    margin: 0 auto;
}

@media only screen and (max-width: 600px) {
    body {
        width: 95%;
    }
}

.sub {
    font-size: small;
}

.cn {
    font-family: SimSun;
}

.highlight {
    color: red;
}