JSFiddle - React, Tailwind, and code Playground

HTML

<div class="brand">
  <span class="letter-border">K</span>haled
</div>

CSS

body {
  font-family: sans-serif;
}

.brand {
  color: blue;
  font-size: 3rem;
  font-weight: bold;
}

.letter-border {
  border: 2px solid blue;
  border-right-width: 0;
  color: magenta;
  padding-inline: 0.2rem;
}