* {
  box-sizing: border-box;
}
body {
  background-color: #ffffff;
  padding: 20px;
}
.gallery-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 3px 0 rgba(255, 255, 255, 0.3);
  width: 100%;
  margin:  auto;
  padding: 10px;
}
.gallery-item {
  flex-basis: 32.7%;
  margin-bottom: 6px;
  opacity: .85;
  cursor: pointer;
}
.gallery-item:hover {
  opacity: 1;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.gallery-content {
  font-size: .8em;
}

.lightbox {
  position: fixed;
  display: none;
  background-color: rgba(0, 0, 0, 0.8);
  width: 100%;
  height: 100%;              
  overflow: auto;
  top: 0;
  left: 0;
}
.lightbox-content {
  position: relative;
  width: 70%;
  height: 70%;
  margin: 5% auto;
}
.lightbox-content img {
  border-radius: 7px;
  box-shadow: 0 0 3px 0 rgba(225, 225, 225, .25);
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 7px;
  top: 45%;
  cursor: pointer;
}
.lightbox-prev {
  left: 0;
}
.lightbox-next {
  right: 0;
}
.lightbox-prev:hover,
.lightbox-next:hover {
  opacity: .8;
}

@media (max-width: 767px) {
  .gallery-container {
      width: 100%;
  }
  .gallery-item {
      flex-basis: 49.80%;
      margin-bottom: 10px;
  }
  .lightbox-content {
      width: 80%;
      height: 60%;
      margin: 15% auto;
  }
}
@media (max-width: 480px) {
  .gallery-item {
      flex-basis: 100%;
      margin-bottom: 1px;
  }
  .lightbox-content {
      width: 90%;
      margin: 20% auto;
  }
}