#wrapper{background:#ffffff;}
#content img {
    display: block;
	margin-bottom:-1px;
}
.position-relative{
    position: relative;
}
.position-absolute {
    position: absolute;
}

.position-relative .link-img{
    width: 100%;
}
.position-relative a {
    position: absolute;

}
.btn-tc{
    left: 40%;
    top: 88%;
    height: 8%;
    width: 21%;
}
.position-sticky{
    width: 100%;
    bottom: 0;
    z-index: 99;
    overflow: hidden;
    position: sticky;
    position: -webkit-sticky;
}
.btn-bk{
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
}