Как закрывать меню при нажатии в не дива на чистом js?

function f1() { 
var a = document.getElementsByClassName("car")[0]; 
  display = a.style.display; 
  if (display == "none") { 
    a.style.display = "block"; 
  } else { 
    a.style.display = "none"; 
  } 
} 
 
function CloseClickOutside(e) { 
    if(!e.target.matches('button')) { 
        document.getElementsByClassName("car")[0].style.display = 'none'; 
    } 
} 
document.addEventListener('click', CloseClickOutside); 
document.addEventListener('touchstart', CloseClickOutside);

<div class="car" style="display:none">car</div> 
<button onclick="f1()">Close/Open</button>

var a = document.getElementsByClassName("car")[0]; 
   
function f1() { 
  display = a.style.display; 
  if(display == "none") { 
    a.style.display = "block"; 
  } else { 
    a.style.display = "none"; 
  } 
} 
 
window.addEventListener("click", function(event) {   
  if(!event.target.closest('#menu-btn')) { 
    a.style.display = "none"; 
  }  
});

<div class="car" style="display: none;">car</div> 
<button onclick="f1()" id="menu-btn">Close / Open</button>