#big-wrapper{ display: flex; flex-direction: column; min-height: 100%; justify-content: space-between;  }
/* #big-wrapper header{ flex-basis: 190px; min-height: 190px; width: 100%;  } */
#big-wrapper header{ flex-basis: 80px; min-height: 80px; width: 100%;  }
/* #big-wrapper #principal { flex-grow: 1; flex-shrink: 1; } */
#big-wrapper footer{ flex-basis: 60px; min-height: 60px; margin-top: 30px; border-top: 1px solid #cdcdcd; }