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src/theme/themes/default.js

@@ -2,7 +2,9 @@ import { createTheme } from '@mui/material/styles';
 import { MAIN_BACKGROUND } from '../../colors';
 
 const nav = {
-  background: '#1a3533',
+  background:
+    'linear-gradient(90deg, #183331 0%, #1d3a38 25%, #1a3533 60%, #17302e 100%)',
+  backgroundColor: '#1a3533',
   mainBackground: MAIN_BACKGROUND,
   item: '#9cb8b4',
   itemHover: '#243f3d',