.float--overlay {
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: auto;
    background-color: rgba(0,0,0,.5);
    position: fixed;
    height: 100%;
    z-index: 2000;
}
.float--hidden {
    overflow: hidden;
}
.float-child { position: fixed; overflow: hidden;z-index:2001}
.float-child img { width: 100%; }
.float-child .btn-close {
    background: url(close.png) no-repeat center center;
    background-size: contain;
}
.float-child .btn-close a {
    display: block;
    width: 32px;
    height: 32px;
    margin: 24px auto;
    cursor: pointer;
}