refactor grid system

Signed-off-by: duxiaofeng-github <297951292@qq.com>
update coffee

Signed-off-by: duxiaofeng-github <297951292@qq.com>
update gitignore

Signed-off-by: duxiaofeng-github <297951292@qq.com>
Signed-off-by: duxiaofeng-github <297951292@qq.com>