nutui/lib/plugin/cli/site/demo/asset/css/custom.scss

// Color
$primary-color: #4169e1;
$gradient-start-color: mix($primary-color, #fff, 60%);
$gradient-end-color: mix($primary-color, #fff, 80%);
$btn-gradient-bg: linear-gradient(315deg, $gradient-start-color 0%, $gradient-end-color 100%);