Hi there! Okay, so CSS (Cascading Style Sheets) is a special language that helps make our websites look pretty. Just like how we use different colors and decorations when we draw a picture, CSS helps us choose how our website looks.
Now, when we talk about "CSS David", we're actually talking about a very specific thing. See, there's this cool guy named David DeSandro who made some really neat CSS code that makes it look like your website is folding and unfolding like a paper. It's called the "CSS David" effect because David made it.
Basically, what happens is that we use CSS to create a bunch of rectangles (like a bunch of squares in different sizes) and then we use more CSS to make them move and fold onto each other. It looks kind of like how you might fold a paper airplane! And it's really cool because we can use the CSS David effect to make our websites look more unique and interesting.
So, in summary, CSS helps make our websites look cool and the "CSS David" effect is a special way of using CSS to make our websites look like they're folding and unfolding like paper. And we can thank David DeSandro for being so smart and creative!