JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="header"></div>
    <div class="content">
        some text here
        <div>
            Empty Lines following
            <br/>
            <br/>
            <br/>
            <br/>
            <br/>
            end of empty lines
        </div>
        <br/>
        The footer is bellow me
    </div>
    <div class="footer"></div>
</div>

CSS

html,body
{
    padding: 0px;
    margin: 0px;
    color: #555;
    font-size: 20px;
    font-family:  "Open Sans","lucida grande","Segoe UI",arial,verdana,"lucida sans unicode",tahoma,sans-serif;
}

.container
{
    height: 100%;
    background-color: white;
}

.header 
{
    height: 300px;
    width: 100%; 
    background-color: Red;
    position:relative;
    top: 0;
}

.content
{
    width: 100%;
    background-color: Black;
}

.footer
{   
    height: 500px;
    width: 100%;
    background-color: green;
    position: relative;
    bottom: 0px;
}