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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  /* viewport height */
}

main {
  flex: 1;
  margin-top: 3.75rem;
  /* ocupa todo el espacio sobrante */
}

footer {
  margin-top: 3.75rem;
}

@media screen and (max-width: 768px) {
  main {
    margin-top: 60px;
  }


}