Hi,

Please try add more this code to Customize > Custom CSS to do that:

\
.overlay-post-box-meta, .overlay-post-box-meta .overlay-share span, .overlay-post-box-meta .overlay-share a, .overlay-post-box-meta .overlay-share a:hover{ color: #ff0000; }\
.overlay-post-box-meta > div:after{ border-color: #888; }\

If you want to change color for only comment text, please use:

\
.overlay-post-box-meta .overlay-share a, .overlay-post-box-meta .overlay-share a:hover{ color: #ff0000; }\
.overlay-post-box-meta > div:after{ border-color: #888; }

Change color code  ff0000 above to any color code you want. You can get a color code here

Best Regards,

PenciDesign