Improve summary design
Improve summary design

KINGSABRI/editor-legacy,Futuring/editor-legacy,philschatz/gitbook-editor,gdbooks/editor-legacy,GitbookIO/editor-legacy,zhanghuiguoanlige/editor-legacy,GitbookIO/editor-legacy,Futuring/editor-legacy,KINGSABRI/editor-legacy,zhanghuiguoanlige/editor-legacy,philschatz/gitbook-editor,gdbooks/editor-legacy,gdbooks/editor-legacy,GitbookIO/editor-legacy,KINGSABRI/editor-legacy,Futuring/editor-legacy,zhanghuiguoanlige/editor-legacy