I've made Start a function but...?

Question

how do I make it to change from main menu to the game screen? I am using HTML , CSS, JavaScript. can you help me with a code and can you tell me where to insert this code and can you also give information? please. if I'm finished, I'll first run the code and check for any errors, then I'll publish it. I know as a fact that some of you will love it

could you maybe also give me advice for drawing objects

Yours Sincerely

Edwin S. Pratt

Answer 1

I think that you must use this format for objects:
HTML
<div id=dog></div>

CSS
#dog {
color: brown;
height: 11px;
width: 5px;
length: 6px;
}