Add CSS in a function

I got my function to display my site to full screen :

  } else {
    if (document.exitFullscreen) {
      document.exitFullscreen();
    }
  }

that I associate with a button image and it worked !

But when I move my cursor over it, the cursor remains in “default” version so I would like it to become “pointer” to give the effect of a button : “cursor: pointer;” and I don’t manage to enter my css in the function to make it work.

Answer

So basically what you can do is

button{
  cursor:pointer;
}

<button>Hello there</button>

You can also add a class to your button

.btn{
  cursor:pointer;
}

<button class="btn">Hello there</button>