* { box-sizing: border-box;}


#outer{
  width: 70vmin;
  margin: 0 auto;
  height: 70vmin;
  background-color: royalblue;
  padding: 15vmin 11vmin 10vmin 11vmin;

}


#secondring{
  background-color: mediumpurple;
  padding: 16vmin 8vmin 15vmin 8vmin;
  height: 50vmin;
}


#innersquare{
  background-color: maroon;
  height: 30vmin;
  padding: 15vmin 11vmin vmin 18vmin;
}