JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="list-unstyled margin-bottom-30">
  <li><strong>Lundi au Vendredi: </strong> 08h30 - 12h00 <br>  <strong style="display: none;">Lundi au Vendredi :</strong>  13h00 - 17h30</li>
  <li><strong>Samedi: </strong><span style="width:25px"></span>09h00 - 12h00</li>
  <li><strong>Dimanche: </strong> Fermé</li>
</ul>

CSS

ul {
  display: table;
}

li {
  display: table-row;
}

strong {
  display: table-cell;
}