Small programs use npm packages to customize global styles

1.vant Weapp uses css variables to implement custom themes. For the basic usage of css variables, refer to the MDN documentation:

https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties

2. Customize the global theme style

In app.wxss, write css variables to take effect globally:

/*app.wxss*/page{/*Customize alert button background color and border color*/--button-danger-background-color:#e2bcbc;--button-danger-border-color:#83b8e4;}