JSFiddle - React, Tailwind, and code Playground

HTML

<div id="color-1"><input type="text" ng-model="color_1" placeholder="Enter Color #1" />
</div>

<div id="color-2"><input type="text" ng-model="color_2"
    placeholder="Enter Color #2" />
<h1>{{color_2}}</h1>
</div>

<div id="color-3"><input type="text" ng-model="color_3"
    placeholder="Enter Color #3"/>
<h1>{{color_3}}</h1>
</div>

CSS

html, body {
height: 100%;
margin: 0;
padding: 0;
}

input[type="text"]  {
width:150px;
height: 30px;
 
}

#color-1 {
    height: 33%;
    background: {{yourName}};
    text-align: center;
    vertical-align: top;
    background: red;
    display: flex;
    justify-content: center;
    flex-direction: column;
    
}

#color-2{

    height: 33%;
    background: {{color_2}};
    text-align: center; 
    vertical-align: middle;
}

#color-3{

    height: 33%;
    background: {{color_3}};
    text-align: center; 
    vertical-align: middle;
}