Align text in a table header

Question

It seems align is not working for the th element. Here is my HTML:

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Answer 1

If you want to center the th of all tables:
table th{ text-align: center; }

If you only want to center the th of a table with a determined id:
table#tableId th{ text-align: center; }

Answer 2

Try using style for th

th {text-align:center}