#div1 {
width:204px;
height:100px;
border-radius:100px;
position:relative;
}
#div2 {
width:102px;
height:100px;
border-radius:50px;
position:absolute;
}
.open1 {
background:yellow;
}
.open2 {
background:blue;
}
.open2 {
right:1px;
top:-2px;
}
.close1 {
background:white;
border:2px solid #ddd;
}
.close2 {
left:1px;
background:black;
border:1px solid black;
}