Sidebar link indicator is misplaced if font size is other than default one.

[Omkar76]

Describe the bug
Kinda similar to this bug #6805
The link indicator logic assumes that font size will always be 16px which is default for browsers. But this hardcoded height makes it look misplaced when user has changed default font size from browser settings.

To Reproduce

• Go to browser settings and change default font size to anything other than 16px.
• Go to care and notice the indicator. It's size doesn't change as per new font size.
• Click on some links in sidebar you'll notice it's not positioned correctly before active link.

Expected behavior
Indicator size should change according to font size.
Indicator should be positioned accurately before active link.

Screenshots
font size is 24px. "Sample test" is active but indicator goes below "Resource"

[Omkar76]

@rithviknishad, can you please assign this to me. I've tried a fix for this that seems to work well.