body{
background: #555;
}
#container{
height: 150px;
width: 150px;
background-color: rgba(255,255,255,0.5);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
position: relative;
}
#content{
height: 150px;
width: 150px;
background-color: rgba(0,0,0,0.5);
margin:50px;
position: absolute;
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
}