I've changed it into 10px but it still said it was 12px

<PLEASE USE THIS TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>
https://www.codecademy.com/courses/web-beginner-en-y2Yjd/1/2?curriculum_id=50579fb998b470000202dc8b#

<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

``` First font size change

Some text for you to make tiny!

Some text for you to make normal size!

Some text for you to make super big!

Oops, try again. Did you set the first paragraph's font-size to 10px? It looks like it's 12px. (If you're getting a weird decimal font size, check the Hint.)
<do not remove the three backticks above>

your browser has a minimum font-size setting, preventing font-size smaller then 12px, google how to disable this (For example: disable minimum font-size setting chrome)

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ok ,i got it ,thank you very much!!