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

html, body {
  height: 100%;
}

body {
  background: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.contenedor {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.imagen-sitio {
  width: 80vw;
  max-width: 1280px;
  height: auto;
  display: block;
}

@media (max-width: 768px) {
  .imagen-sitio {
    width: 94vw;
  }
}