Fix: Optimize table style #3221 (#9703)

### What problem does this PR solve?

Fix: Optimize table style
-Modify the style of the table scrollbar and remove unnecessary
scrollbars
-Adjust the header style of the table, add background color and
hierarchy
-Optimize the style of datasets and file tables
-Add a new background color variable

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/tailwind.config.js

@@ -55,7 +55,7 @@ module.exports = {
         'input-border': 'var(--input-border)',
 
         /* design colors */
-
+        'bg-title': 'var(--bg-title)',
         'bg-base': 'var(--bg-base)',
         'bg-card': 'var(--bg-card)',
         'bg-component': 'var(--bg-component)',