JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="menu">
        menu
    </div>
    <div class="content">
        <div>
        <div class="content1">content1</div>
        <div class="content2">content2</div> 
        </div>
    </div>
</div>

CSS

div {
    margin: 2px;
}
.container{
    width: 300px;
    margin: 0 auto;
    border: 1px solid red;
    overflow: hidden;
}

.menu{
    float: left;
    width: 100px;
    border: 1px solid green;
}

.content{
    border: 1px solid blue;
    margin-left: 100px;
    overflow: hidden;
}

.content1{
    float: left;
    height: 50px;
    border: 1px  dotted red;
}

.content2{
    margin-left: 70px;
    border: 1px dotted green;
}