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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
}

header {
  background-color: #333;
  color: white;
  padding: 10px;
  text-align: center;
}

main {
  padding: 10px;
}

#img_turma {
  display: block;
  margin: 5px auto;
}

#img {
  max-width: 100%;
  height: auto;
  display: flex;
  justify-content: center;
}

footer {
  background-color: #333;
  color: white;
  padding: 10px;
  display: flex;
  justify-content: center;
  margin-top: auto;
}

.footer {
  padding: 5px;
}