div
{
  padding:20px;
  margin:5px;
  float: left;
}

#parent-div
{
  width:500px;
  background: gray;
}

#box-one
{
  background: #5497fc;
  width:70px;
}

#box-two
{
  background: #17a4ba;
  width: 70px;
}

#box-three
{
  background: #84b12b;
  width: 70px;
}