figure {
  display: inline-block;
}

#circle1 {
  width: 100px;
  height: 100px;
  background: red;
  border-radius: 50%;
  display: inline-block;
}
#circle2 {
  width: 100px;
  height: 100px;
  background: orange;
  border-radius: 50%;
  display: inline-block;
}
#circle3 {
  width: 100px;
  height: 100px;
  background: yellow;
  border-radius: 50%;
  display: inline-block;
}
#circle4 {
  width: 100px;
  height: 100px;
  background: lime;
  border-radius: 50%;
  display: inline-block;
}
#circle5 {
  width: 100px;
  height: 100px;
  background: lightseagreen;
  border-radius: 50%;
   display: inline-block;
  
}
#circle6 {
  width: 100px;
  height: 100px;
  background: magenta;
  border-radius: 50%;
   display: inline-block;
}