I need help with unity/webgl Canvases

I'm working on an online chess game, and im almost done. The last thing that i need to fix is the promotion buttons. So i have 2 canvases, one for the white pawns and a second for the black pawns : The problem that i have right now is that the canvases look fine in unity editor : But they look small and out of place in webgl final build : https://imgur.com/a/wXkiZl3 These are my canvases settings, they both have the same setting: https://imgur.com/a/7fpJPUC (the first picture is canvases settings and the second and third are the banners behind the buttons, hope that's clear ^^') I hope i provided enough informations about my problem and thank u so much in advince :)