*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    -moz-user-select: none; /*火狐*/
    -webkit-user-select: none; /*webkit浏览器*/
    -ms-user-select: none; /*IE10*/
    -khtml-user-select: none; /*早期浏览器*/
    user-select: none;
    /*overflow: auto; !*避免出现滚动条*!*/
    font-size: 12px; /* larger, smaller */
    color: white;
}
html, body{
    height: 100%;
}
html, body{
    overflow: visible;
}