style

#calaStrona{
  border: 4px solid red;
  background-color: white;
  border-radius: 10px;
  width: 1000px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  opacity: 0.9;
  padding: 20px;

}

#naglowek{
  border: 5px solid green;
}

#nawigacja{
  border: 4px solid pink;
  background-color: #ffd86b;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
}

.main-menu{
  display: inline;
  padding: 20px;
}

a{
  text-decoration: none;
  border-bottom: 3px solid transparent;
  padding-bottom: 3px;
  font-size: 20px;
}

a:hover{
  border-bottom: 2px solid black;
  transition-duration: 0.4s;
}






#calaStrona{
  border: 4px solid red;
  background-color: white;
  border-radius: 10px;
  width: 1000px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  opacity: 0.9;
  padding: 20px;

}

#naglowek{
  border: 5px solid green;
}

#nawigacja{
  border: 4px solid pink;
  background-color: #ffd86b;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
}

.main-menu{
  display: inline;
  padding: 20px;
}

a{
  text-decoration: none;
  border-bottom: 3px solid transparent;
  padding-bottom: 3px;
  font-size: 20px;
}

a:hover{
  border-bottom: 2px solid black;
  transition-duration: 0.4s;
}