JSFiddle - React, Tailwind, and code Playground

HTML

<div class="avatar">
  <div class="character">W</div>
</div>

<div class="avatar">
  <div class="character">y</div>
</div>

CSS

.avatar {
    border-radius: 50%;
    display: block;
    text-align: center;
    width: 125px;
    height: 125px;
    font-size: 60px;
    background-color: rgb(81, 75, 93);
    font-family: "Segoe UI";
    margin-bottom: 10px;
}

.character {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    line-height: 100%;
    color: #fff;
}