#container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  margin:0;
  display:flex;
  justify-content:center;
  align-items:center;
}
#content{
  width:500px;
  height:500px;
  border:5px solid blue;
}
#content{
  width:500px;
  height:500px;
  border:5px solid blue;
  border-radius:50%;
}
#content{
  width:500px;
  height:500px;
  border:5px solid blue;
  border-radius:50%;
  overflow: hidden;
}
#content{
  width:500px;
  height:400px;
  border:5px solid blue;
  border-radius:50%;
  overflow: auto;
  background-image:url('https://projects.codecraftworks.com/web/XvGkRvjxIrbbVfKihDzJ/assets/518851e0-6f32-4c85-8239-326309e2fc93.jpg');
}