update the css for table width bug
index img hover border bug
Update concepts.md
Update concepts.md
Update concepts.md
Merge pull request #101 from SunLn/7284_table_width_too_large

update the css for table width bug
Merge pull request #102 from SunLn/7287_doc_index_img_hover_border

index img hover border bug
修正变量名。
添加新的预设集，以及附注说明。