*,
*:before,
*:after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-size: 12px;
    font-family: Helvetica, Arial, "黑体";
    background: #fff;
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    overflow-x: hidden;
}

input,
button {
    border: none;
    outline: none;
}

a {
    text-decoration: none;
}

.hide {
    display: none;
}

.main-wrap {
    width: 990px;
    margin-left: auto;
    margin-right: auto;
}