Dear kjubee.
Thanks you for using product our.
Please go to template, that set default and select tab" Custom Code/ Before</head>" and
add line the below, you can edit color for it
<style>
.noo-accordion ul li:hover .image_title {
background: linear-gradient(to bottom,rgba(255,175,75,0) 50%,rgba(255,174,73,0) 50%,rgba(25, 110, 55, 1) 100%)!important;
}
</style>
Please view image attachment.
Best Regards,
Huyen Tran