JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
  <span class="title">Szybkie linki</span>
  <span class="link"><a href="#">Regulamin</a></span>
  <span class="link"><a href="#">Konkursy</a></span>
</div>

CSS

body{font-family: arial}

div.box{
  background-color: #222;
  width: 35%; /*Tutaj sobie trzeba zmienic, zapewne u ciebie na 100%*/
  text-align: center;
  text-transform: uppercase;
  color: #f1f1f1;
  font-size: 10px;
  padding-bottom: 1px;
}
div.box > span{
  display: block;
  margin: 5px auto;
  padding: 10px 0;
}
span.title{
  background-color: #0054E8;
  width: 100%;
}
span.link{
  background-color: #555;
  width: 95%;
}
span.link > a{
  color: #f1f1f1;
  text-decoration: none;
}