Need help with simple problem

Hey , I need help fixing a problem.
So when i hover over the images , the images change for that i used this code
.focus-box .service-icon .pixeden:hover {
background: url(http://pokemasterboost.com/wp-content/uploads/2016/08/luel.png) !important;
width: 100%;
height: 100%;
}

But the problem is that all the pictures i hover to change to 1 image and i want them all to change to a different image , here is the link to my site pokemasterboost.com

What do i do to make the pictures change specifically for each image

[moderator note – closed in favor of https://wordpress.org/support/topic/how-do-i-change-image?replies=3]