If you use the code in this form, then there is errors. That's why it does not work.
/ Active color of menu item / .sp-megamenu-parent > li.active > a, .sp-megamenu-parent > li.active:hover > a { color: #b61F29 important!; }
/ Color of hover menu item / .sp-megamenu-parent > li > a:hover, .sp-megamenu-parent > li:hover > a { color: #b61F29 important!; }
Should be
/* Active color of menu item*/ .sp-megamenu-parent > li.active > a, .sp-megamenu-parent > li.active:hover > a { color: #b61F29 !important; }
/* Color of hover menu item */ .sp-megamenu-parent > li > a:hover, .sp-megamenu-parent > li:hover > a { color: #b61F29 !important; }
And the code can be less.
.sp-megamenu-parent > li.active > a,
.sp-megamenu-parent > li.active:hover > a,
.sp-megamenu-parent > li:hover > a {
color: #b61f29 !important;
}