'IFrame wont go fullscreen

so i'm making a shell shockers site for my friends in school, and it wont go fullscreen this is the code iv used. whats wrong??? (I'm sorry if its a simple fix but I used what I saw online to allow this and it doesn't work)

<!DOCTYPE html>
<html>
<head>

    </head>
    <body>
<iframe src="https://playminigames.ru/en/embed/shell-shockers" style="width: 1200px; height: 700px;" frameborder="0" allow="fullscreen" object-fit:screen;></iframe>
        </body>
        </html>
htmliframe


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