JSFiddle - React, Tailwind, and code Playground

HTML

<div class="inner-one container">
    <div class="inner-two">
        <div class="inner-one">M<span class="exponent">2</span>
        </div>
    </div>
</div>

CSS

.inner-one {
    height: 100%;
    width: 100%;
    background: #0066CC;
    border-radius: 50%;
    padding: 10px;
    box-sizing: border-box;
    font-size:350px;
    color:#fff;
    line-height:450px;
    text-align:center;
    font-family:"Avant Garde", sans-serif;
}

.container {
    width: 500px;
    height: 500px;
    margin: 1%;
}

.inner-two {
    height: 100%;
    width: 100%;
    background: white;
    border-radius: 50%;
    padding: 5px;
    box-sizing: border-box;
}

.exponent {
    font-size: 40%;
    vertical-align:top;
    line-height:180%;
}

JavaScript

25