Assalamualaikum and annyeonghaseyo. Pixie dust on cursor. Sorry being busy lately. Piano exam are nearer. Credit to Ayuni. Adios.

1. Dashboard > Template
2. Click ctrl + F then find the code <head>
3. Copy paste this code below the code <head>
<script>var colour="#C4EEFD";
var sparkles=50; </script>
<script type="text/javascript" src="http://yourjavascript.com/12830211019/codethreads-sparkle.js"></script>
4. Preview & save.

Blue : change with yours