How to make full screen background in a web page

Question

How to make an image as background for web page, regardless of the screen size displaying this web page? I want to display it properly. How?

Answer 1

CSS

.bbg { 
    /* The image used */
    background-image: url('...');

    /* Full height */
    height: 100%; 

    /* Center and scale the image nicely */
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;    
}

HTML

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