Widget text color change

This CSS will make your grey text in some else you want:

.widget_posts_wrap .latest-posts .col-md-12 a span {color:#your-hex-code !Important;}

This is for subtitles in this widget where you have latest post.

And this is for titles:

.widget_posts_wrap .latest-posts .col-md-12 h3 a {color: #your-hex-code !important;}

Also just note to change #your-hex-code part with actual hex code.

I hope this helps.