I want to make a changeable background with a button and menu like on the new tab page that google has can you help

CodePudding user response：

Just have the button click set the class to the body tag.

CodePudding user response：

Have the button click by setting an event listener to it

btn stands for the variable referencing the button element. It's just a personal preference, you can name the variable your choice.

btn.addEventListener("click", function(){
  // code to be executed
}