Send Again Button Constantly Flickering

[QasimArif]

Describe the bug
When visiting the mobile site, the Send Again and Send button constanly flicker. This only occurs when you're at the top of the page.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://postwoman.io/'
2. Scroll to the very top. See buttons flicker.

Expected behavior
No flickering

Screenshots
If applicable, add screenshots to help explain your problem.

Screen recording

Smartphone (please complete the following information):

• Device: Huawei Mate 20 Pro
• OS: Android
• Browser: Chrome

[liyasthomas]

Issue has been identified. Will get back to you ASAP.

[liyasthomas]

It has been found that, this issue is caused by different viewport on mobile devices. And it is a device specific bug. Since it's not a universal bug, it somehow went unnoticed.
Working on a fix right now.

[NBTX]

@liyasthomas perhaps we should just hide the send again button until the first request has been sent? That kind of kills two birds with one stone for me, so to speak.

[yemkhaung]

Device: Galaxy S5 (Chrome Dev Tools)

Found that it flickers at a certain point of scrolling when Send button starts to move top right screen. Also saw a IntersectionObserver toggling "show" CSS class). Not sure that's the case.