body, div, span, p, var, em, strong, a, h1, h2, h3, h4, h5, h6, input, textarea, ul, li, img {
    margin: 0;
    padding: 0;
}
div, div img {
    border: none;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;/*去手机蓝边*/
    -webkit-appearance: none;/*去手机蓝边*/
}
input,textarea {
    border: 0; /* 去掉input,textarea的内阴影：方法1 */
    -webkit-appearance: none; /* 去掉input,textarea的内阴影：方法2 */
}
html {
    width: 100%;
    height: 100%;
}
body {
    width: 100%;
    overflow-x: hidden;
    background: #fff;
    font-size: 3.7vw;
}
a {
    text-decoration: none;
    color: #000;
}

.afix {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    display: none;
    overflow: auto;
    overflow-y: scroll;
    background-color: rgba(0,0,0,.7);
}
.box {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    display: none;
    overflow: hidden;
    overflow-y: scroll;
    -webkit-box-align: center;
    -webkit-box-pack:center;
}