Expand button regression

[puku0x]

📚 Docs or angular.io bug report

Description

The expand button is not rendered correctly on mobile since v8.

🔬 Minimal Reproduction

See, for example, https://angular.io/guide/displaying-data on mobile device.

What's the affected URL?**

Every pages using <aio-toc />

https://angular.io/...

Reproduction Steps**

Go to any page with toc on mobile.

Expected vs Actual Behavior**

📷Screenshot

v7	v8

v7	v8

🔥 Exception or Error

None

🌍 Your Environment

Browser info

• macOS 10.14.5 Chrome 75.0.3770.100
• iPhone 12.31 Safari

Anything else relevant?

[puku0x]

@gkalpak @sjtrimble
The changes in #31173 seem to cause this style regression.

[gkalpak]

Thx for looking into it, @puku0x. I think it will be fixed by #31533. Can you confirm?

[puku0x]

@gkalpak
I confirmed #31533 solves the problem, thank you!

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