"Background Color Changing "
Bootstrap 3.0.0 Snippet by vara24

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE HTML> <html> <head> <style type="text/css"> body { background-color: red; transition: background-color 7s; } </style> </head> <body> <script type="text/javascript"> var colors = ["#FF3547", "#ff1744", "#ffa726", "#eeff41", "#00C851", "#40c4ff", "#8c9eff", "violet"]; var i = 1; window.setInterval(function(){ document.body.style.backgroundColor = colors[i]; i++; if (i === colors.length){ i=0; } }, 5000); </script> </body> </html>

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