* { 
  margin: 0; 
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden; 
}

header h1 { 
  color: rgb(45, 45, 121); 
  background-color: #90CAF9; 
  display: flex; 
  justify-content: center; 
  padding: 10px; 
}

main {
  flex-grow: 1;
  width: 100%;
  height: 100%;
}

.lago-azul { 
  width: 100%;
  height: 100%;
  object-fit: cover; 
}