JSFiddle - React, Tailwind, and code Playground

HTML

Bureaublad
<div class="taakb" > 
    <div class="start"> 
        Start
    </div> 
    <div class="clock"> 
        14:29
    </div> 
</div>

CSS

body { 
    background-color: #008080;
    padding: 0;
} 

.taakb { 
    background-color: #c0c0c0; 
    position: fixed;
    bottom: 0px;
    width: 100%;
    overflow: auto;
}

.start {
    border: 2px outset #ccc;
    float: left;
    width: 50px;
    text-align: center;
}

.clock {
    border: 2px groove #ccc;
    float: right;
    width: 50px;
    text-align: center;
}