body {
  margin: 0;
  min-height: 50vh; /* conteúdo suficiente para rolar */
  background: linear-gradient(to bottom, #ffffff 0%, #ffffff 25%, #f4f4f4 50%, #f4f4f4 100%);
  background-attachment: fixed;
  font-family: sans-serif;
  padding: 0.5rem;
}