*{
    margin:0;
    padding:0
}
body{
    height: 100vh;
    font-size: 5px;
        background-image: url(../image/bacnground.png);
		background-size: 100% 100%;
		background-repeat: no-repeat;
}
.index{
    width: 100%;
}
.head{
    padding-top:60px;
    margin-bottom: 25px;
}
.head img{
    width: 45%;
    height: 20%;
    display: block;
    margin: 0px auto;
}
.center{
    width: 100%;
    margin-bottom: 40px;
}
.center img{
    width: 75%;
    height: 100%;
    display: block;
    margin: auto;
}
.bottom{
    width: 100%;
}
.bottom img{
    width: 98%;
    display: block;
    margin: auto;
    height: 10%;
}