JSFiddle - React, Tailwind, and code Playground

HTML

<a class="button" href="">
    <div class="center">
        <img src="http://dummyimage.com/30x30/cf97cf/fff">
        <div class="btnText">
          Button  
          <span>Button alt</span>
        </div>
    </div>
</a>

CSS

body {
    padding: 20px;
}

.button {
    background: #000;
    color: #fff;
    text-decoration: none;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    height: 120px;
    padding: 30px 50px;
    display: inline-block;
}
span {
    font-size: 11px;
    color: #ccc;;
    display: block; 
}
img {
    vertical-align: middle; 
    display: inline-block;
}
.center {  
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}
.btnText {
    vertical-align: middle; 
    display: inline-block;
}