style: Update Sepolia background color

[amandaye0h]

Description

This updates the background color of Sepolia so that it looks more cohesive with other network logos in the network menu.

Related issues

Fixes:

Manual testing steps

1. Open MetaMask
2. Click on network selector

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

✨ Files requiring CODEOWNER review ✨

🖥️ @MetaMask/wallet-ux

• ui/css/utilities/colors.scss

[metamaskbot]

Builds ready [7f24ce3]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all CircleCI artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1223 ± 54 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Home	uiStartup	1223	1099	1385	54	1257	1311
			load	1073	967	1205	47	1123	991
			domContentLoaded	1066	963	1194	48	1117	987
			domInteractive	17	13	63	8	16	33
			firstPaint	852	76	1200	385	182	988
			backgroundConnect	10	6	31	4	9	10
			firstReactRender	19	14	56	6	19	29
			getState	13	5	42	9	7	8
			initialActions	0	0	1	0	0	0
			loadScripts	817	719	926	45	844	883
			setupStore	7	5	20	2	7	8
	Webpack	Home	uiStartup	2137	1701	2547	172	2250	2362
			load	1673	1293	2053	150	1756	1947
			domContentLoaded	1668	1289	2049	149	1751	1940
			domInteractive	17	12	62	11	14	50
			firstPaint	163	64	363	60	249	83
			backgroundConnect	33	11	418	43	34	53
			firstReactRender	182	52	436	114	59	89
			getState	14	4	230	30	7	9
			initialActions	3	1	6	1	3	5
			loadScripts	1656	1252	2046	153	1742	1916
			setupStore	22	6	289	37	35	9
Firefox	Browserify	Home	uiStartup	1409	1219	1878	159	1462	1816
			load	1257	1078	1730	151	1310	1651
			domContentLoaded	1257	1077	1730	151	1310	1651
			domInteractive	104	38	431	45	90	98
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	28	17	125	14	29	52
			firstReactRender	24	19	70	7	24	32
			getState	10	4	181	19	7	9
			initialActions	0	0	1	0	1	1
			loadScripts	1231	1054	1711	149	1286	1598
			setupStore	7	4	49	5	6	8
	Webpack	Home	uiStartup	1548	1332	2173	165	1603	1964
			load	1334	1146	1935	155	1397	1705
			domContentLoaded	1334	1146	1935	155	1396	1705
			domInteractive	96	36	176	23	90	98
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	24	17	61	7	25	39
			firstReactRender	36	27	70	7	38	50
			getState	9	4	31	6	7	9
			initialActions	1	0	2	1	1	1
			loadScripts	1312	1127	1913	155	1378	1676
			setupStore	8	4	39	5	7	9

Bundle size diffs

• background: 0 Bytes (0%)
• ui: 0 Bytes (0%)
• common: 0 Bytes (0%)

[metamaskbot]

Builds ready [5571766]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all CircleCI artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1206 ± 52 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Home	uiStartup	1206	1097	1366	52	1232	1321
			load	1057	947	1195	50	1106	986
			domContentLoaded	1051	940	1191	50	1108	987
			domInteractive	17	13	59	6	16	29
			firstPaint	748	78	1194	409	234	988
			backgroundConnect	11	6	60	7	9	10
			firstReactRender	20	15	57	5	20	29
			getState	13	4	33	7	6	9
			initialActions	0	0	1	0	0	1
			loadScripts	800	683	934	50	825	919
			setupStore	8	5	103	10	7	8
	Webpack	Home	uiStartup	2271	1736	2867	233	2424	2701
			load	1786	1354	2537	223	1923	2135
			domContentLoaded	1780	1350	2532	222	1908	2127
			domInteractive	18	12	75	10	17	47
			firstPaint	178	66	393	73	273	83
			backgroundConnect	40	11	421	51	41	66
			firstReactRender	170	56	370	110	66	94
			getState	16	4	219	23	6	9
			initialActions	3	1	8	1	4	5
			loadScripts	1766	1346	2528	214	1893	2076
			setupStore	28	6	351	51	36	9
Firefox	Browserify	Home	uiStartup	1349	1149	1925	160	1372	1768
			load	1204	1025	1749	144	1226	1615
			domContentLoaded	1204	1025	1748	144	1226	1615
			domInteractive	101	37	388	44	91	98
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	26	16	126	15	25	50
			firstReactRender	22	19	50	5	22	30
			getState	9	4	159	16	7	8
			initialActions	0	0	1	0	0	1
			loadScripts	1180	1006	1710	144	1196	1594
			setupStore	8	4	205	20	6	7
	Webpack	Home	uiStartup	1574	1360	2097	154	1648	1966
			load	1353	1178	1900	150	1428	1738
			domContentLoaded	1352	1177	1900	150	1428	1737
			domInteractive	97	70	186	21	88	96
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	27	19	60	7	29	41
			firstReactRender	38	29	59	6	42	51
			getState	10	4	30	6	8	9
			initialActions	1	0	2	1	1	1
			loadScripts	1328	1153	1876	149	1391	1711
			setupStore	9	5	35	5	8	9

Bundle size diffs

• background: 0 Bytes (0%)
• ui: 0 Bytes (0%)
• common: 0 Bytes (0%)

[georgewrmarshall]

We may also want to update mobile https://vscode.dev/github/MetaMask/metamask-mobile/blob/main/app/util/networks/index.js#L101