body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    text-align: left;
}

.gallery img {
  max-width: 100%;
  height: auto;
  margin: 0px;
  cursor: pointer;
}

.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  text-align: center;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90%;
  margin: auto;
  display: block;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 30px;
  cursor: pointer;
  color: #fff;
}