htmlTTF File from Google FOnts doesnt work how can i fix this?

Question

I don't know what's the problem, is it the quotation or is it something else? My code is below I use Bootstrap Heading tag and the id is "title", please help me out, thank you in advance

what seems to be the problem?

here is my code:

 @font-face {
        font-family: 'Heebo-Regular';
        src: url("res/fonts/Heebo/Heebo-Regular.ttf");
    }
    
    #title {
        font-family: 'Heebo-Regular';
    }