Can't resize image using CSS

Question

I\'ve tried every answer I could find on all the sites I could find, but still haven\'t been able to properly resize an image using CSS. I\'ve got it inside a div, and tried

Answer 1

CSS-Tricks has the best solution for this that I could find

html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

Link to CSS-Tricks for the source and original code: https://css-tricks.com/perfect-full-page-background-image/