Hello @odsadmin,
Thanks for writing in!
Please add following CSS under X > Theme Options > CSS:
@media only screen and (max-width: 600px) {
.wpb-js-composer .vc_tta.vc_tta-style-modern .vc_tta-panel-heading {
background-color: #f1813a !important;
border-color: #f1813a !important;
}
.wpb-js-composer .vc_tta-color-orange.vc_tta-style-modern .vc_tta-panel .vc_tta-panel-title>a {
color: #ededed;
}
.wpb-js-composer .vc_tta-color-orange.vc_tta-style-modern .vc_tta-panel.vc_active .vc_tta-panel-title>a {
color: #666 !important;
}
.wpb-js-composer .vc_tta.vc_general .vc_tta-panel.vc_active .vc_tta-panel-heading {
border-color: #f0f0f0 !important;
background-color: #f8f8f8 !important;
}
}
1- I have found the proper CSS code selector using the Chrome browser Developer Toolbar: https://www.youtube.com/watch?v=wcFnnxfA70g
2- For the CSS code itself, I suggest that you get started with this tutorial: https://www.youtube.com/watch?v=yfoY53QXEnI
Thanks.