nutui/sites/demo/asset/css/custom.scss

// Color
$primary-color : green;
$gradient-start-color: mix($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%);