text: window.onload = function () {
      document
          .querySelector(".menu_mobile")
          .addEventListener("click", function () {
              if (
                  document.querySelector(".menu nav ul").style.display == "flex"
              ) {
                  document.querySelector(".menu nav ul").style.display = "none";
              } 
              
              else {
                  document.querySelector(".menu nav ul").style.display = "flex";
              }
          });
  };