Default blockquote style is identical to regular text

[singpolyma]

Without and left line or similar

[zhgchgli0718]

Could you provide more detailed information or an HTML string?
In my test case, the rendered result is as expected.

[singpolyma]

Hmm if it's just padding maybe putting it in a small container eats the padding. Ideally I'd like to render it with a line down the side per usual