.menu-left__link:hover:not(.menu-left__link--level-2) {
    background-color: #03b;
    color: white;
}

.menu-left__link.menu-left__link--active {
    background-color: #03b;
    color: white;
}

.menu-left__trigger:checked ~ .menu-left.menu-left--submenu {
    background-color: #e2e2e2;
}