You too should add !important to your CSS declarations in your layout. Your posts do not look as intended with the theme I'm using. And maybe also add this:
It's not bad practice. It certainly will not be always needed, but since your overriding the boards internal CSS code, it's recommended. Only custom classes and and IDs don't require !important since you're creating your own code.
Voila puisque je trouve que je me debrouille bien en anglais , j'ai enlevé l'annotation en bas de ma bio , il faut que j'essaie de l'utiliser qu'en dernier recours !