JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
    <div id="first"></div>
    <div id="second"></div>
    <div id="third"></div>
</div>

CSS

div {
    display: block;
}
#wrapper {
    width: 400px;
    height:400px;
}

#first {
    float:left;
    width: 33%;
    height: 100%;
    background: red;
}

#second {
    float:left;
    width: 67%;
    height: 30%;
    background: green;
}

#third {
    float:left;
    width: 67%;
    height: 70%;
    background: blue;
}