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Put it in custom css helixultimate
.sp-megamenu-parent .sp-dropdown li.sp-menu-item:hover, .sp-megamenu-parent .sp-dropdown li.sp-menu-item.active {
background-color: green; /* your color there*/
}
.sp-megamenu-parent .sp-dropdown .sp-dropdown-inner {
box-shadow: 0px 6px 8px rgba(0, 0, 0, 0.1);
padding: 0px 0px;
padding-bottom: 1px;
padding-left: 1px;
padding-right: 1px;
padding-top: 1px;}
sp-megamenu-parent .sp-dropdown .sp-dropdown-items {
list-style: none;
padding: 0;
margin: 0;
}
.sp-megamenu-parent .sp-dropdown li.sp-menu-item > a, .sp-megamenu-parent .sp-dropdown li.sp-menu-item span:not(.sp-menu-badge) {
line-height: 1;
display: block;
padding: 15px 15px;
cursor: pointer;
}
/* fin background color hover sub menu item */```