CSS self-adapting problem

1. Picture Adaptive

     srcset= "App-logo.png 175w,app-logo-double.png 365w"
     Sizes= "(max-width:640px) 365px,175px"
/>

Srcset: List of resource files  
Sizes: (max-width:640px) 365px,175px  width not exceeding 640px use 365px size picture, the rest of the case uses 175px size picture.

2. Interface self-adapting

@media screen and (min-width:1280px) {} with      a minimum resolution of 1280px

@media only screen and (max-width:1280px) and (min-width:640px)    resolution up to 1280px with a minimum of 640px

CSS self-adapting problem