"CSS z-index & Overflow Explained in depth web development html Super Easy Guide"

What is z-index? (Very Easy Explanation)

When two boxes overlap, z-index decides which box will come on TOP.

Bigger z-index = box comes front
Smaller z-index = box goes back


z-index: 1 → small number, so it stays behind



z-index: 5 → big number, so it comes on top





What is overflow? (Very Easy Explanation)

When content becomes bigger than the box, overflow decides what to do.

Types:

visible → content bahar dikhai dega

hidden → extra content hide ho jayega

scroll → scrollbar hamesha dikhayega

auto → scrollbar jab zarurat ho tab dikhayega
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