View file vendor/symfony/error-handler/Resources/assets/css/error.css
body { background-color: #fff; color: #222; font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; margin: 0; } .container { margin: 30px; max-width: 600px; } h1 { color: #dc3545; font-size: 24px; } h2 { font-size: 18px; }