Simple multicoloured background and highlighted button in HTML & CSS

This is a simple demo of how to create a multicoloured website background and add highlights to objects (in this case a button) using box-shadow property and animation.

I wanted to learn how to make the site's background more creative. Instead of using one same palette for the site how can I add 2 or more different colours and blend them. After doing some research box-shadow seemed like an easy way to achieve that.

What is box-shadow ? It …

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