.b1 {
    position: relative;
    display: block;
    margin: 0 auto 18.67vw;
    width: 100%;
    height: 486.93vw;
    background: url("../images/home/kh_01.png");
    background-size: 100% 100%;
}

.btn img{
    position: fixed;
    display: block;
    bottom: 10px;
    width:90%;
    margin: 5%;
     /* height: 18.67vw; */
    /* background: url("../images/home/2.png"); */
    /* background-size: 100% 100%;  */
}
.maianImg{
    width: 100%;
    margin: 0;
    border: 0;
    display: block;
}