body {
  font-family: Arial, sans-serif;
  margin: 0;
}

nav {
  background-color: #6a759a;
  padding: 10px;
  text-align: center;
}

.nav-button {
  display: inline-block;
  padding: 10px 20px;
  margin: 5px;
  background-color: #22264a;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

.nav-button:hover {
  background-color: #372f91;
}

.uvitani {
  text-align: center;
  font-size: 50px;
  font-weight: bolder;
  padding: 20px;
  color: white;
  background-color: black;
}

.titulek {
  text-align: center;
  font-size: 40px;
  color: white;
  background-color: black;
}  

.autor {
  text-align: center;
}