Change color and hover color for side menu hamburger icon

Add this css to wp-admin -> theme options -> general settings -> quick css

@media (max-width: 991px) {
.kleo-mobile-switch span.icon-bar {
background-color: red !important;
}

.kleo-mobile-switch:hover span.icon-bar {
background-color: yellow !important;
}


Replace colors with your desired colors