Why all my elements are aligned towards the left and my second paragraph isn't displayed?

Question

I have a very basic html code and all the elements are asigned to the left and my second paragraph is not displayed

#bar {
  align-items: center;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
}

<div id="bar">
  <h2>title</h2>
  <p>paragraphtext1</p>
  <img src="" alt="logo" />
  <img src="" alt="logo" width="720" />
  <img src="" alt="logo" />
  <img src="" alt="logo" width="720" />
  <img src="" alt="logo" />
  <p2>hi</p2>
</div>

Answer 1

To make align-items: center; justify-content: center; rules work, add display: flex; as well. If you just want to align items horizontally, you can use text-align: center; instead of those three rules. Also, p2 is not a valid HTML tag. Change it to p and it should work fine.