Can't figure out why it's saying my font size is wrong

Error message says

Oops, try again.
It looks like your second <li>'s font-size is 16px instead of 12px.

Dunno if I’m missing < or > or / or what.

<!DOCTYPE html>
        <title>Loving the font changes</title>
        <h1 style="font-family: Arial">Big title</h1>
             <li style="font-family: Arial; size: 16px">This item is big Arial.</li>
             <li style="font-family: Verdana; size: 12px">This item is medium Verdana.</li>
             <li style="font-family: Impact; size: 10px">This item is small Impact.</li>

Thanks for your help.

to change the font size write like
font-size: 16px;

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