html, body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, textarea, p, aside, blockquote, th, td, span, i, b {
    margin: 0;
    padding: 0;
}

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    box-sizing: border-box;
    outline: none;
    font-family: 'Microsoft Yahei';
}

/*@media screen and (min-width: 320px) and (max-width: 374px) {
    html {
        font-size: 16px;
    }
}

@media screen and (min-width: 375px) and (max-width: 479px) {
    html {
        font-size: 18px;
    }
}

@media screen and (min-width: 480px) and (max-width: 539px) {
    html {
        font-size: 20px;
    }
}

@media screen and (min-width: 540px) and (max-width: 639px) {
    html {
        font-size: 24px;
    }
}

@media screen and (min-width: 640px) {
    html {
        font-size: 28px;
    }
}*/