<!DOCTYPE html>
<style>
.a {
    height: 200px;
    width: 500px;
}
.b {
    float: left;
    background: red;
    height: 150px;
    width: 200px;
}
.c {
    float: right;
    background: green;
    height: 100px;
    width: 200px;
}
.d {
    float: right;
    background: blue;
    height: 100px;
    width: 200px;
}
</style>
<div class="a">
    <div class="b"></div>
    <div class="c"></div>
    <div class="d"></div>
</div>
