JSFiddle - React, Tailwind, and code Playground

HTML

<div id="body">
    <div id="blockHeader"></div>
    <div class="header">
        <div class="large">Header</div>
    </div>
    <div class="content">
        Content, you should be able to see this when you scroll to top.
    </div>
    <div class="footer">
        <div class="large">Footer</div>
    </div>
</div>

CSS

html, body {    margin:0;
    padding:0; }

#body {
    height: 200px;
    background: black;
    width: 100%;

}

#blockHeader 
{ 
    width:100%;
    height: 5em;
    margin:0;
    padding:0;
}

.header {
    position: fixed;
    top: 0;
    background: #369;
    z-index: 1;
    width: 100%;
    height: 5em;
}
.content {
    position: absolute;
    overflow: hidden;
    height: 1000px;
    background: #936;
    z-index: 0;
    width: 100%;
}
.footer {
    position: fixed;
    bottom: 0;
    background: #396;
    width: 100%;
}
.large {
    font-size: 120%;
    padding: 2em;
}