Then in the CSS window of that plugin you would put:
.widget-title {
color: #FC9F00;
}
where #FC9F00 you would replace with your desired color number.
Now that we know #FC9F00 is orange color, we can open style.css in a text editor and search for that number and you will find other places with orange color. This way you can change all of them.
Thank you very much. I have substitude color in Css of simple Custom and it work: overlay title color is changed. Unfortunately the article title is not chanced. Where have I to change it? Thanks