<input type="checkbox" id="checkm"> 
<label for="checkm" id="lblch" class="btn btn-menur"><i class="fas fa-bars"></i></label>

<div id="contenedor-menur">
<a href="crear-factura" class="btn-a" style="margin-left:10px"><i class="fas fa-file-invoice fa-lg"></i> Emitir factura</a>
<a href="crear-boleta" class="btn-a"><i class="fas fa-file-invoice fa-lg"> </i> Emitir boleta</a>
<a href="crear-nota" class="btn-a"><i class="fas fa-file-invoice fa-lg"> </i> Nota de Venta</a>
</div>