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Refs #1381
Improves the focus indicators. Based on WCAG 2.2 standards, it is a better idea to have solid outlines instead of a dotted outline for focus indicators. Also, color change for focus indication isn't great because it doesn't often work for color blinded people.
So things done in this PR:
<a>
element to the<li>
element.These address the below concerns by @thibaudcolas in #1381
Attaching some screenshots of the changes:
![image](https://private-user-images.githubusercontent.com/9530293/338640429-91880579-8217-474b-9644-3b3bb9eda009.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.CxpT5SZ2Gp4WnphQMvDpWXPKWuDbXpSoqOV660tcGdY)
![image](https://private-user-images.githubusercontent.com/9530293/338640544-21b7cec3-dbc6-44f8-93b5-a8943ddb0f33.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.gVIPXGTueI0Tr6K0Q_IUkgVdg-8gUCWjNA4BnnpsrdY)