.fotos{
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: wrap;
    margin: 0 -4px -4px 0;
    padding: 0px;
}

/* .fotos:after{
    content: "";
    flex: auto;
    justify-content: space-around;
} */

.fotos .photo-parent, .fotos .photo-empty{
    margin: 20px;
    width: 500px;
    height:auto;
}

.photo-parent img{
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    /* max-height: 100%; */
}

.fotos .photo-empty{
    height: 0;
    border: none;
    margin: 0px;
  }

.centerer{
    max-width: 3000px;
}

header .centerer{
    max-width: 900px;
}

*,
:before,
:after {
  box-sizing: border-box;
}