body {
  background-image: linear-gradient(162deg, #228be6 5%, #3bc9db 95%);
  color: #000;
  min-height: 100vh;
}
/* «панелька» вокруг основного контента */
.page-wrapper {
  background-color: #fff;
  border-radius: 0.5rem;
  padding: 2rem;
  margin: 2rem auto;
  max-width: 1200px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.navbar .nav-link:hover {
  background-color: rgba(255,255,255,0.2);
  border-radius: 0.25rem;
}