.gallery-container {
  width: 100%;
  display:flex;
  justify-content:flex-start;
  flex-wrap:wrap;
}

.gallery-item {
    width:25%;
    text-align:center;
    margin-bottom:1em;
}

.gallery-img {
  max-width: 100%;
  cursor: pointer;
}

.lightbox-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,.8);
  display: -ms-flexbox;
  display: flex;
  z-index: 1
}

.lightbox-container {
  position: relative;
  margin: auto;
  background: #fff;
  padding: 1em;
  border-radius: .2em
}

.lightbox-image{
    width:400px;
}

.close-modal {
  background: tomato;
  color: #fff;
  position: absolute;
  width: 1.8em;
  height: 1.8em;
  text-align: center;
  line-height: 1.8em;
  top: -.9em;
  right: -.9em;
  border-radius: 50%;
  cursor: pointer
}

.lightbox-description {
  text-align: center;
  font-size: 1.1em
}

.lightbox-navigation {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-pack: justify;
  justify-content: space-between;
  font-size: .9em;
  opacity: .8
}

.lightbox-navigation__button {
  text-decoration: none;
  color: tomato
}