.demo-gallery > ul {
  list-style-type: none;
  padding-left: 15px;
}

.demo-gallery > ul > li {
  margin-bottom: 15px;
  width: 300px;
  display: inline-block;
  margin-right: 15px;
  list-style: outside none none;
}
.demo-gallery .demo-gallery-poster img {
  height: 300px;
  opacity: 0.8;
  width: 300px;
  border-radius: 10px;
}

.demo-gallery > ul > li:hover .demo-gallery-poster > img {
  opacity: 1;
  transform: scale3d(1.05, 1.05, 1.05);
}