Problems with media querry at Aditional CSS

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Hi,

I am trying to make my Buttons menu responsive for mobiles, but it is not working. It works when I add to all Buttons this code:

flex-direction:column;
gap:15px;

But when I add media query like this, it does nothing:

@media screen(min-width:768px){
flex-direction:column;
gap:15px;}

Do you have any idea, where could be a problem? The theme is Upside down.

Thanks

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