change the color of the frame when hovering

Hello, I would like to change the color of the frame when hovering over an article in my carousel.

I managed to change the color of the active dot with the CSS below but I can’t do the same for the frame:

.psac-slider-and-carousel .owl-dots .owl-dot.active {
background: #9c0c00;
}

Can anyone help me with this?

Thanks in advance

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