1. Go to THIS site, copy the code. Go to Customize > Edit HTML and paste the code BEFORE the </head> tag (use CTRL+F to find it). If it doesn’t work, try putting the code before the </body> tag.
2. Changing the color: if you want it to be colorful, you don’t need to change anything. But if you want just one color, replace “random” with color you want. Remember: it must be a HTML color (examples: black - #00000, blue - #0000ff).
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