Come si crea un menu Toggle

label {
cursor: pointer;
}
#menu-toggle {
  display: none;  
}
#menu {
  display: none;
}
#menu-toggle:checked + #menu {
	 
  display: block;
  position: fixed;
  top: 50%;
  left: 50%;  
  transform: translate(-50%, -50%);	
  padding: 100px;
  z-index: 999 !important;
  background-color:white

}

---

<label for="menu-toggle" class="btn btn-outline-orange">Cliccami!!</label>
<input type="checkbox" id="menu-toggle"/>
<div id="menu">
 <img src="https://serreri.com/assets/img/qrCode_sito.png" >
  <label for="menu-toggle" class="btn btn-outline-orange">Chiudi!</label>
</div>

---

Cliccami!!