Because Chromium 54.x use not only own GTK3 theme, but partially use system theme, there is hover item in drop-down menus shows without gradient background and border. Use strict background-color with solid color before gradient background-image will fixes this issue.
Because Chromium 54.x use not only own GTK3 theme, but partially use system theme, there is hover item in drop-down menus shows without gradient background and border. Use strict background-color with solid color before gradient background-image will fixes this issue.