@charset "utf-8";
*{margin:0 auto; padding:0 auto;}
html,body{
    width:100%;
    height:100%;
    overflow-x:hidden;
    overflow-y:hidden;
   }

#btn1{
    width:21%;
    height:8%;
    top:76%;
    left:39.5%;
    position: relative;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }

#btn2{
    width:17%;
    height:5%;
    top:91%;
    left:-13.5%;
    position: relative;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }

#btn3{
    width:20%;
    height:5%;
    top:94%;
    left:68.5%;
    position:fixed;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }

#mbtn1{
    width:50%;
    height:7%;
    top:83%;
    left:25%;
    position: relative;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }

#mbtn2{
    width:40%;
    height:4%;
    top:92.5%;
    left:-35%;
    position: relative;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }

#mbtn3{
    width:40%;
    height:4%;
    top:95.5%;
    left:55%;
    position:fixed;
    border: 0;
    BACKGROUND-COLOR: transparent;
    background:transparent;	/*按钮背景透明*/
    border-width:0px;	/*边框透明*/
    outline:none;	/*点击后没边框*/
    cursor:pointer;
    }