/* 样式初始化 */
*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
html,body{
    width: 100%;
height: 100%;
}
a,a:link,a:visited,a:hover,a:active {
    text-decoration: none !important;
}
li{
    list-style: none;
}
button,input{
    outline: none;
    border: none;
}
button:active{
    opacity: .75;
}