JSFiddle - React, Tailwind, and code Playground

HTML

<div class="gauche largeur640px gras" id="tabs_0">
    <div class="gauche largeur640px" style="padding: 10px 0;">
								<div class="gauche gras" style="width: 150px;">
									Lundi								</div>
								
								<div class="gauche centrer" style="width: 340px;" id="tabs_[0][1]">
									<input type="hidden" name="tabs_[0][1][jour]" value="1">
									De <input type="time" name="tabs_[0][1][from_h]" id="tabs_[0][1][from_d]" step="1" min="00:00" max="23:59" value="00:00" class="margeHautMoins4px"> Ă  
									<input type="time" name="tabs_[0][1][from_f]" id="tabs_[0][1][from_f]" step="1" min="00:00" max="23:59" value="00:00" class="margeHautMoins4px">
								</div>
								
								<div class="gauche" style="margin-left: 50px;">									<div onclick="addRow(0,1);" class="gauche contentBulle marge0_5"><div class="bulle"><div class="contentBulleFleche"></div><div class="contentBulleDescription" style="font-weight: normal;font-size: 13px;">Ajouter une tranche horaire.</div></div><img src="https://cdn2.iconfinder.com/data/icons/freecns-cumulus/16/519691-199_CircledPlus-16.png" width="16&quot;" height="16" alt=""></div>
                                    <div onclick="delRow(0,1);" class="gauche contentBulle marge0_5"><div class="bulle"><div class="contentBulleFleche"></div><div class="contentBulleDescription" style="font-weight: normal;font-size: 13px;">Supprimer une tranche horaire.</div></div><img src="https://cdn2.iconfinder.com/data/icons/freecns-cumulus/16/519643-144_Forbidden-16.png" width="16&quot;" height="16" alt=""></div></div>
																	</div>
							</div>

JavaScript

function addRow(num_tab, num_jour) {
    $( "<div>TEST</div>" ).insertAfter( "#tabs[0][1]" );
}