#825 CSS Fix: My title is displayed at the wrong position on Webkit browsers

main header.article>div:not(.shadow) {
  justify-content: end;
}

main header.article>div:not(.shadow) {
  justify-content: flex-end;
}

On Firefox (Gecko), the following CSS instruction puts the title block at the bottom of the header: ```css main header.article>div:not(.shadow) { justify-content: end; } ``` But under Webkit Browsers, such instruction is ignored:  Patching it to the following however solves the problem: ```css main header.article>div:not(.shadow) { justify-content: flex-end; } ```  Some disclaimers about this pull request: - I have not yet tested the patch and this fix might have been done at the wrong place - The fix might be needed in other places, especially in the other included theme - I don't understand exactly why Gecko and Webkit do not behave the same in this case