[Bug] Make UI adjustment for change network page for Dashboard

[wenluomask]

Bug Info

How to reproduce?

1.Go to Dashboard's Wallet page;
2.Click connect wallet or change wallet to open change network page;

What happened?

What should happen?

Adjust the UI and delete all the plugins below, just keep change wallet card.

Environment

Mask Version:

• (Browser) Installed from the extension store (version: )
• (App) Installed from the app store (version: )
• master branch
• Build of version/commit hash:

(Please write down build command/flags if there is anything special)

System

• Windows 10
• Mac OS X Catalina
• Linux:

Platform/Browser

• Latest Chrome (stable channel)
• Latest Firefox (stable channel)
• Android 11
• iOS 14

[wenluomask]

Change the border line's color to #eff3f4

Current color:

Correct color in twitter:

[wenluomask]

Checked.