#adminmenu .menu-icon-jem_case .wp-menu-image:before {
    content: '';
    background-color: currentColor; /* base color */
    -webkit-mask: url('<?php echo MY_PLUGIN_URL; ?>svg/icon.svg') no-repeat center;
    mask: url('<?php echo MY_PLUGIN_URL; ?>svg/icon.svg') no-repeat center;
    -webkit-mask-size: 20px 20px;
    mask-size: 20px 20px;
}