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.box2 {
    width:100vw;
    height:100vh;
    background-color:#000;
    position:fixed;
    left:0;
    top:0;
    transition:all .6s;
    z-index:-1;
}
.box {
    width:200px;
    height:200px;
    position:absolute;
    left:0;
    right:0;
    top:0;
    bottom:0;
    margin:auto;
}
.btn {
    cursor:pointer;
    width:140px;
    height:60px;
    background-color:rgba(224,222,222,.8);
    border:1px solid rgb(239,237,237);
    color:#fff;
    font-size:22px;
    border-radius:60px;
    box-shadow:0 10px 2px 0 #ccc,0 10px 8px 0px rgb(248,246,246) inset,0 0 6px 0px #ccc inset;
}
.btn:active {
    margin-top:2px;
    box-shadow:0 8px 2px 0 #ccc,0 10px 8px 0px rgb(248,246,246) inset,0 0 10px 0px #ccc inset;
}
.btn:active+.box2 {
    opacity:0;
}
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