# Compatibility
The support for prefers-color-scheme and CSS variables may vary depending on your browser and operating system.
You can check the level of support on caniuse (opens new window):
In case the support for these specifications is not available, Succinct will fallback to the light theme. You can override this behavior through $fallbackTheme in palette.styl file.
// .vuepress > styles > palette.styl
// fallback theme
$fallbackTheme = 'dark'