JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modbtn mod-rep"><a href=""><i class="fa fa-thumbs-o-up"></i> Akcja "Dziękuję za pomoc"</a></div>

CSS

.modbtn a, .profile-signature .modbtn a {
   font-size: 13px;
  width: 100%;
  padding: 7px;
  margin: 4px;
}
.mod-rep a {
  background: seagreen;
  color: #fff;
}
.modbtn a {
  font-size: 17px;
  width: 60%;
  padding: 15px;
  margin: 15px auto;
  display: block;
  border-radius: 3px;
  text-align: center;
}
.mod-rep a:hover {
  background: #006E68;
  color: #fff;
}