Concentric traingles

by Kondal Durgam

HTML

<div class="outer circle border_color">
  <div class="inner circle border_color">
  
  </div>
</div>

CSS

.border_color{
  border-radius : 50%;
}
.circle {
    border: 1px solid red;
}
.outer{
 background-color:blue;
  width:400px;
  height:400px;
  position:relative;
}
.inner{
  width:94%;
  position:relative;
  height:94%;
  top:3%;
  left:3%;
  background-color:green;

}