bigbroso
Hi
the blue color is from style code
Add this code in /css/custom.css file in the template
.acm-slideshow .owl-carousel .item .slider-content-inner {
background-color: #132e5e;}
replace this color code with your color code for example this is lighter color : http://prntscr.com/ulhldh
.acm-slideshow .owl-carousel .item .slider-content-inner {
background-color: #132e5e82;
}