body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(to bottom, #e0f7fa, #ffffff);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.header {
  background-color: #ffffff;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.header img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: 10px;
}
nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #00796b;
  font-weight: bold;
}
main {
  flex: 1;
  padding: 20px;
}
footer {
  background-color: #00796b;
  color: white;
  text-align: center;
  padding: 10px;
}