.box1 {
	float: left;
	border-color: yellow;
	width: 465px;
}

.box2, .box3, .box4 {
	float: left;
	width: 500px;
	border: 1px solid #000;
}

.box5, .box6, .box7 {
  float: left;
  border-color: blue;
  width: 33.3333%;
}

.box8, .box9, .box10, .box11 {
  float: left;
  border-color: green;
  width: 25%;
  font-size: 30px;
}

.boxA {
  border: none;
  &:after {
    content: "";
    display: block;
    clear: both;
  }
}