Fixes #862: Improve reconnect error page.

[enesonus]

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What's this PR do?
Fixed image scaling problem when resizing screen and buttons' position is aligned with texts at all possible window sizes.

Screenshots?

You have tested this PR on:

• Windows
• Linux/Ubuntu
• macOS

[tarun-kanojia]

@zulipbot claim

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[tarun-kanojia]

@zulipbot add "good first issue"

[tarun-kanojia]

@zulipbot "help wanted"

[enesonus]

Hey @timabbott the issue seems to persist on the last version of Zulip. Can you please give a review on the changes I made?

[mdaatifayman786]

@zulipbot claim

[zulipbot]

Hello @mdaatifayman786!

Thanks for your interest in Zulip! You have attempted to claim an issue without the label "help wanted". You can only claim and submit pull requests for issues with the help wanted label.

If this is your first time here, we recommend reading our guide for new contributors before getting started.

[enesonus]

Hi @timabbott this PR is currently up to date with the main and fixes #862 (seems to be still open) can you give a review please?