html, body {
min-height: 100%;
}
body {
background: url(https://www.elementaryos-fr.org/wp-content/uploads/2013/09/wallpaper-1923233.jpg) 50% 50% / cover no-repeat;
}
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$(document).snowfall();
$(window).resize(() => {
$(document).snowfall('clear');
$(document).snowfall();
});
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This Pen doesn't use any external CSS resources.