div {
	padding: 10px;
  float: left;
  margin: 5px;
}

#parent {
	width: 500px;
  background-color: gray;
}
#one {
	background-color: red;
}
#two {
	background-color: green;
}
#three {
	background-color: blue;
}

.box {
	width: 70px;
}