how to add full screen background image in css code example

Example 1: set background image full screen css

#mainBackground{
    width: 100%;
    height: 100%;
    max-height: 100%;
    margin: 0;
    padding: 0;
    background-image: url("https://images.unsplash.com/photo-1487058792275-0ad4aaf24ca7?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80");
    background-size:100% 100%;
    background-repeat: no-repeat;

}
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

Example 2: css background image full screen responsive

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;
}

Example 3: CSS make image fill whole background

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;
}

Example 4: background image css fill screen

.Background {
  background-image: url("Your picture name.jpg");
  background-repeat: no-repeat;
  height: 100%;
  background-position: center;
  background-size: cover;
}

Example 5: how to fit background image in html

/* To make an Image fit the Screen*/


METHOD - 1

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

METHOD - 2

IMP: To make sure that the image covers the whole screen, 
you must apply **height: 100%** to both <html> and <body>:

body, html {
  height: 100%;
}

Example 6: how to cover full background with css

<div id="bg">
  <img src="images/bg.jpg" alt="">
</div>

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