xxxxxxxxxx
<div id="regle" class="container-fluid" style="display:none;">
<div class="row">
<?php
for ($i = 0; $i < 12; $i++) {
?>
<div class="col bg-light border text-center"><?= $i+1 ?></div>
<?php
}
?>
</div>
</div>
<br>
<button type="button" class="btn btn-outline-danger" onclick="var v=document.getElementById('regle');if(v.style.display==''){v.style.display='none'}else{v.style.display=''}">Mesurer</button>