Bootstrap background color settings related

01-Table background color setting

For details, see the blog post https://blog.csdn.net/wenhao_ir/article/details/132796188 , search for "Set colors for table rows or cells"

02-Background color setting of div block

For details, see the blog post https://blog.csdn.net/wenhao_ir/article/details/133071721 . The first few sample codes in this blog post all have settings for div blocks.