JSFiddle - React, Tailwind, and code Playground

HTML

<div id='content'>
    <ul>
        <li>Your body content can go in here</li>
        <li>Your body content can go in here</li>
        <li>Your body content can go in here</li>
    </ul>
    <div id='border'></div>
    <div id='textArea'>
        <ul>
            <li>Your footer can go in here</li>
            <li>Your footer can go in here</li>
            <li>Your footer can go in here</li>
        </ul>
    </div> 
</div>

CSS

body{
    margin-left: 0px;
    margin-right: 0px;
}

ul{
    margin-top: 0px;
}

#content {
    background-color: orange;
}

#border {
    width: 100%;
    height: 50px;
    background-color: lightblue;
    border-top-left-radius: 50%;
    border-top-right-radius: 50%;
}
#textArea {
    padding-left: 20px;
    width: 100%;
    height: 70px;
    background-color: lightblue;
}