To change the colour of rule line and call to action box, please do the following:
Please don’t forget to take a back up of the file prior to any changes.
Add the following style in wp-content/themes/vertoh-child/style.css
.fullwidth.site-slider .section-content .absolute.slider-content hr.short.bg-gold { background:none repeat #FF0000 !important }
.fullwidth.site-slider .section-content .absolute.slider-content a.section-button {border-color:#FF0000; }
If you would like to change the background colour of the Call to action button, then please add the following style with in the second css.
ie
.fullwidth.site-slider .section-content .absolute.slider-content a.section-button {border-color:#FF0000; background:none repeat #FF0000 ; }
You can change the colour #FF0000 to your colour
Save the file.