JSFiddle - React, Tailwind, and code Playground

HTML

<div class="A">
    <div class="C">
        <div class="B">
            <div class="B2"></div>
            <div class="B2">
                <div class="E"></div>
            </div>
            <div class="C">
                <div class="D"></div>
            </div>
        </div>
    </div>
</div>

CSS

.A {
    background-color: blue;
    height: 200px;
}
.B {
    height:100px;
}
.B2 {
    background-color: red;
    height: 100px;
    width: 100px;
    float: left;
}
.C {
    float: left;
}
.D {
    height: 40px;
    width: 40px;
    float:left;
    background-color: yellow;
}
.E {
    height: 50px;
    width: 10px;
    background-color: black;
    float: right;
}