This is the reason why my friend who joined during the same registration period as me accidentally declined my friend request the first time, lol.
I almost declined a gift just now, the 'decline' button is the closer option and stands out more, it's basically asking to be clicked. And not only that, the 'accept' button has no colorful outline, unlike the two buttons in the next example. 'Decline' is the default option clearly.
When it comes to writing forum posts, the yellow button that sticks out among the grey-blue color scheme is the 'submit' button, and the 'cancel' button has no box or outline at all.
My suggestion would be to swap the positions of the 'accept/decline' buttons on gift and friend request pages, and make the 'accept' button the yellow one.
Possible cons: muscle memory for veteran players who have gotten used to this weird inconsistently might screw them over for a short time period.