通用样式设置

*,
::after,
::before{
    margin: 0;
    padding: 0;
    /*盒子模型*/
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    /*字体*/
    font-family: '微软雅黑', sans-serif;
    /*取消默认点击高亮效果*/
    -webkit-tap-highlight-color: transparent;
}

/*去除默认的样式*/
ol,ul{
    list-style: none;
}
input{
    border-style: none;
    /*移除iOS原生显示样式*/
    -webkit-appearance: none;
}
/*去掉 a 标签的下划线*/
a{
    text-decoration: none;
}
.f_l{
    float: left;
}
.f_r{
    float: right;
}
/*清楚浮动*/
.clear_fix::before,
.clear_fix::after{
    content: '';
    display: block;
    height: 0;
    line-height: 0;
    clear: both;
    visibility: hidden;
}