Try to add the following code snippet to the Custom CSS area in Theme Setting

.page-template-portfolio .page-title,
.single-portfolio .page-title {
background-color: #efefef;
}

.single-portfolio .page-title.color-scheme-light .breadcrumbs a, 
.single-portfolio .page-title.color-scheme-light .breadcrumbs span,
.page-template-portfolio .page-title.color-scheme-light .breadcrumbs a, 
.page-template-portfolio .page-title.color-scheme-light .breadcrumbs span,
.page-template-portfolio .page-title  h1,
.single-portfolio .page-title h1 {
	color: #212121;
}