I want to change the phone number's text color on the secondary menu FOR MOBILE

Hey erkuto,
To change the background color for mobile only, Please try this code in the General Styling > Quick CSS field:

@media only screen and (max-width: 767px) { 
.responsive #top .av_header_transparency #header_meta {
background-color:  rgba(0, 0, 0, 0.6) !important;
}
}

To change the color of the text for mobile only, try this css:

@media only screen and (max-width: 767px) { 
.responsive #top .av_header_transparency #header_meta span,.responsive #top .av_header_transparency #header_meta span a {
color:  #000 !important;
}
}

Best regards,
Mike

Hi,
Glad we were able to help, we will close this now. Thank you for using Enfold.

For your information, you can take a look at Enfold documentation here
For any other questions or issues, feel free to start new threads under Enfold sub forum and we will gladly try to help you :)

Best regards,
Mike