URL: https://www.rakuten.co.jp/

Browser / Version: Firefox Nightly Mobile 66.0a1 (2018-12-17)
Operating System: LG G5 (Android 7.0) - 1440 x 2560 pixels (~554 ppi pixel density)
Tested Another Browser: Yes

Problem type: Design is broken
Description: Elements from top of the page are cropped after scrolling the page
Steps to Reproduce:

1. Navigate to https://www.rakuten.co.jp/
2. Scroll down the displayed screen.
3. Reach back the top of the screen.
4. Observe the elements above the search bar.

Expected Behavior:
The elements from the top of the page(logo and button icons) must be displayed with no cropping issues.

Actual Behavior:
The elements from the top of the screen are cropped.

Notes:

1. The issue is not reproducible on Chrome Mobile 71.0.3578.98
2. Screenshot attached.

Affected area:

<ul class="rtHeader__function">
	<li class="rtHeader__guide">
	<!-- cut off-->	
</ul>

Watchers:
@softvision-oana-arbuzov
@softvision-sergiulogigan
@cipriansv

sv; country: jp

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