Add down caret to Chart dropdown

[pavel-lens]

It's hard to spot that this element (see screenshot) is actually a dropdown. A small caret on the right side, as usual dropdown has, would help recognize it.

https://explorer.dcrdata.org/charts?chart=privacy-participation&zoom=jzuht6o0-kb1fzeo0&bin=day&axis=time&visibility=true-false

[sbulhoesspiria]

This is due to the -webkit-appearance:none style on all select element meaning that all dropdowns aren't showing the default caret.

[ukane-philemon]

@chappjc, -moz-appearance: none & -webkit-appearance:none styles on all select elements cause them to not show the default dropdown caret.

I'd like to know why we chose not to use the default dropdown caret(IMO it looks good), and also why we decided to show the caret for only a few chosen select elements. I think it is good UX if the dropdown caret is shown when there are select options.

Default

Custom