Answers for "html background image size to fit in html"

background image size css

#example1 {
  background: url(mountain.jpg);
  background-repeat: no-repeat;
  background-size: auto;
}

#example2 {
  background: url(mountain.jpg);
  background-repeat: no-repeat;
  background-size: 300px 100px;
}

html background image fit to screen

body {
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
}