[horde] IMP´s compose window textarea border color

[Luis Felipe Marzagao]

When composing a new message in IMP in Microsoft Edge, the cursor 
"disappears" every time it reaches the leftmost side of the textarea. 
Actually, it does not disappear, but it can't be seen because it has the 
same color as the border.

The same thing does not happen with Firefox because the textarea border 
is blue, so the cursor remains visible.

Please, see attached screenshots.

Is the border color something that can be controlled by horde's CSS 
code, or something related only to each browser?

Any pointer on how it could be fixed in Microsoft Edge?

Thanks a lot!

Luis Felipe
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