How do you autofocus a canvas?

Question

I need to autofocus a canvas on my snake game. Check it out on my profile. I need to be able to make the user focus on the game before it starts. any ideas? Please look through my code, because I used the power of google, and to my dismay, it failed.

Answer 1

//Canvas can't be auto focused but you can give canvas border a attractive color

//css

canvas{
border:2px solid red;
box-shadow:0 4px 8px red;
}