*{   box-sizing:border-box; }

#outer{
width:70vmin;
height:70vmin;
margin:0 auto;
background-color: #ffc400; 
padding:15vmin 11vmin 15vmin 11vmin;

  
}
#secondring{

background-color: #f7e400;
padding:15vmin 7vmin 15vmin 7vmin;    
height:50vmin;
  
}
#innersquare{
  
background-color: #f2ed7a;  
padding:20px;
height:30vmin; 
}