Feature: Update colors for for dark theme #1476

[Charlesnorris509]

Description:
This pull request addresses issue [#1476] by updating the color scheme for the dark theme to reduce bright colors and make the theme more suitable for dark mode. The changes include updating various color values in the Tailwind CSS configuration and the main CSS file.

### Changes Made:

_frontend/tailwind.config.cjs:
Updated the color values for different elements in the dark theme:
White text in dark theme: #E0E0E0
Modal background: #26272E
Table borders and other lines: #3D3D40
Input fields/dropdowns borders: #6A6A6A

frontend/src/index.css:
Updated the color values for different elements in the dark theme:
Background color for dark theme: #26272E
Text color for dark theme: #E0E0E0
Scrollbar track color for dark theme: #3D3D40
Table border and text color for dark theme: #3D3D40 and #E0E0E0
Input autofill background and text color for dark theme: #3D3D40 and #E0E0E0_

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Name	Status	Preview	Comments	Updated (UTC)
docs-gpt	❌ Failed (Inspect)			Jan 21, 2025 5:19pm

[dartpain]

Hey, there seems to be a build error
error during build:
[vite:css] [postcss] /vercel/path0/frontend/src/index.css:54:5: The dark:border-3D3D40 class does not exist. If dark:border-3D3D40 is a custom class, make sure it is defined within a @layer directive.
file: /vercel/path0/frontend/src/index.css:54:4
at Input.error (/vercel/path0/frontend/node_modules/postcss/lib/input.js:106:16)
at AtRule.error (/vercel/path0/frontend/node_modules/postcss/lib/node.js:145:32)
at processApply (/vercel/path0/frontend/node_modules/tailwindcss/lib/lib/expandApplyAtRules.js:380:29)
at /vercel/path0/frontend/node_modules/tailwindcss/lib/lib/expandApplyAtRules.js:551:9
at /vercel/path0/frontend/node_modules/tailwindcss/lib/processTailwindFeatures.js:55:50
at async plugins (/vercel/path0/frontend/node_modules/tailwindcss/lib/plugin.js:38:17)
at async LazyResult.runAsync (/vercel/path0/frontend/node_modules/postcss/lib/lazy-result.js:261:11)
at async compileCSS (file:///vercel/path0/frontend/node_modules/vite/dist/node/chunks/dep-CB_7IfJ-.js:36897:21)
at async Object.transform (file:///vercel/path0/frontend/node_modules/vite/dist/node/chunks/dep-CB_7IfJ-.js:36170:11)
at async transform (file:///vercel/path0/frontend/node_modules/rollup/dist/es/shared/node-entry.js:18848:16)
Error: Command "npm run build" exited with 1

[Charlesnorris509]

@dartpain would you be able to tell me whether the modifications made on the initial PR were accurate?