JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<div class="first">Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo </div>
<div class="static">Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo </div>
<div class="third">Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo Demo </div>
</div>

CSS

.container {
    display:-webkit-box;
    -webkit-box-orient:horizontal;
    -webkit-box-align:stretch; 
     display:-moz-box;      
    -moz-box-orient:horizontal;
    -moz-box-align:stretch;
    display:box;
    box-orient:horizontal;
    box-align:stretch;   
color: #ffffff;    
}    

div {
    height: auto;
}

.first {
 background-color: #546547;   
}

.static {
 background-color: #154d67;
    width: 660px;  
}

.third {
 background-color: #c00000;   
}

.first, .third {
    -webkit-box-flex:1.0;
    -moz-box-flex:1.0;
    box-flex:1.0;
}