Bs5 dark theme fixes 2

[Aniket-Engg]

fixes #6234
fixes #6230 (comment)

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[joeizang]

• Margins on the outside are still very small. From the image, you see that the input field is sitting right on the terminal.

• This caret should have the right color, see the image below:

• Border is the wrong color.

• The borders and button text colors need to be fixed.

• Margins between elements is off.

• Some buttons don't have the right text color:

• Width adjustment seems to be broken now. This is not the case on remix.ethereum.org

This is on the preview link:

• Error cards seem to be the wrong size