#parent-div{
  width: 500px;
  background: gray;
  padding: 20px;
  margin: 5px;
  float: left;
}

#boxer-one {
  background: red;
  width: 70px; 
  padding: 20px;
  margin: 5px;
  float: left;
}

#referee {
  background: white;
  width: 70px; 
  padding: 20px;
  margin: 5px;
  float: left;
  
}

#boxer-two {
  color: white;
  background: blue;
  width: 70px;
  padding: 20px;
  margin: 5px;
  float: left;
}