.sidebar-item:not(.sidebar-item-section):has(a[href$="hw1sol.html"]),
.sidebar-item:not(.sidebar-item-section):has(a[href$="hw2sol.html"]),
.sidebar-item:not(.sidebar-item-section):has(a[href$="hw3sol.html"]) {
  display: none !important;
}

.nav-page:has(a[href$="hw1sol.html"]),
.nav-page:has(a[href$="hw2sol.html"]),
.nav-page:has(a[href$="hw3sol.html"]) {
  display: none !important;
}