JSFiddle - React, Tailwind, and code Playground

HTML

<h2 class="titoloPagina">
<span>Title</span>
</h2>

CSS

h2 {
  line-height:70px;
}
h2:first-letter {
  color:#1D5987;
  display:block;
  float:left;
  font-family:Bell MT;
  font-size:70px;
  padding-right:3px;
}
h2 span {
  border-bottom:7px solid #1D5987;
  color:#538CC3;
  font-family:Bell MT;
  font-size:30px;
  margin-left: 4px;
  padding-bottom: 5px;
}