.galerie_photo {
  font-size: 0;
  width: 75%;
  margin: 30px auto;
  padding-top: 30px;
  padding-bottom: 30px;
}

.galerie_photo a {
  font-size: 16px;
  overflow: hidden;
  display: inline-block;
  width: calc(50% - 4px);
  margin-bottom: 8px;
  margin-right: 8px;
}

.galerie_photo a:nth-of-type(2n) {
  margin-right: 0;
}

@media screen and (min-width: 800px) {
  .galerie_photo a {
    width: calc(25% - 6px);
  }
  
  .galerie_photo a:nth-of-type(2n) {
    margin-right: 8px;
  }
  
  .galerie_photo a:nth-of-type(4n) {
    margin-right: 0;
  }
}

.galerie_photo a:hover img {
  -webkit-transform: scale(1.15);
          transform: scale(1.15);
}

.galerie_photo img {
  border: none;
  max-width: 100%;
  height: auto;
  display: block;
  background: #ccc;
  -webkit-transition: -webkit-transform .2s ease-in-out;
  transition: -webkit-transform .2s ease-in-out;
  transition: transform .2s ease-in-out, -webkit-transform .2s ease-in-out;
}