body{
  margin:0;
  font-family:Arial;
  background:linear-gradient(135deg,#0d6efd,#00c6ff);
}

header{
  text-align:center;
  color:white;
  padding:20px;
}

nav{
  background:white;
  text-align:center;
  padding:10px;
}
nav a{
  margin:10px;
  text-decoration:none;
  color:#0d6efd;
  font-weight:bold;
}

section{
  background:white;
  margin:15px;
  padding:20px;
  border-radius:10px;
}

.btn{
  background:#0d6efd;
  color:white;
  padding:10px;
  border:none;
  border-radius:5px;
  cursor:pointer;
}