You can change the highlight on the text this way by pasting custom CSS code in custom/custom.css file or in Custom CSS tab in theme options panel –
#home2-heading .heading2 h2 {
background: #DC4637; /* IE8 fallback */
background: rgba(220, 70, 55, 0.7); /* Change to your color in rgba sytnax */
}
for team members and portfolio/blog hover backgrounds –
.image-info, .team-member .team-member-hover {
background: #DC4637;
background: rgba(220, 70, 55, 0.7);
}
and for menu highlight –
#primary-menu .hover-bg, #primary-menu > ul.menu > li:hover > ul.sub-menu {
border-color: #DC4637;
}
More information on rgba syntax here –
http://www.w3schools.com/cssref/css_colors_legal.asp