Flexbox is a powerful tool to build responsive layouts.
Adding flex class to a div would create a flex container.

Classes with prefix justify- controls how elements in a flex container are positioned.

• justify-center would justify elements along the center.
• justify-between would make sure there are equal spaces around each element.

Check these docs for further details:

• Flex - Tailwind CSS
• Justify Content - Tailwind CSS
• Flexbox - Learn web development - MDN