JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="item">
        <div class="item-inner">
            <a>
                Botón
            </a>
        </div>
    </div>
    
    <div class="item">
        <div class="item-inner">
            <a>
                Botón
            </a>
        </div>
    </div>
    
    <div class="item">
        <div class="item-inner">
            <a>
                Botón
            </a>
        </div>
    </div>
</div>

CSS

.container {
  height: 20em;    
  display: flex;
  flex-direction: column;
  border: 5px solid black
}

.item {
    flex: 1;
    border-bottom: 1px solid white;
}

.item-inner {
    height: 100%;
    width: 100%;
    display: table;
    
}

a {
    background: orange;
    display: table-cell;
    vertical-align: middle;
    
}