Change the color of connections lines

Hello, I would like to change the connections lines color.

I tried in the styles_custom_v2 to do this :

.connectionline, .connectionlineGradient { stroke-width: 3px !important; color: #76d46f; }

The result of this code is that the stroke width is working but I can't change the color of the connections lines.

Is there any solution to put a default color to the connections lines ?

I obviously restarted my server and empty the cache of the browser.

Thanks for your answers,

Friendly.

color connection-line map-object