* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
.gallery img {
  -webkit-transition: all .3s ease-in-out;
  -moz-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
}
.gallery {
  width:100%;
  margin: auto; 
  border: 2px solid #CCC; 
  padding: 5px; 
  background-color: #FFF;
}
.gallery img {
  max-width: 100%;
}
.gallery .mainImg {
  position: relative;
  margin-bottom: 15px;
}
.gallery .mainImg img {
  display: block;
  margin: auto;
}
.gallery .mainImg i {
  color: #FFF;
  width: 20px;
  height: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  transform: translateY(-50%);
  cursor: pointer;
}
.gallery .mainImg i.fa-chevron-circle-left {
  left: 0;
  color: #7B68EE;
}
.gallery .mainImg i.fa-chevron-circle-right {
  right: 0;
  color: #7B68EE;
}
.gallery .thumbnails {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: space-between;
}
.gallery .thumbnails li {
  cursor: pointer;
}
.gallery .thumbnails li:not(:last-child) {
  margin-right: 5px;
}
.gallery .thumbnails li img {
  border: 2px solid #CCC;
  padding: 2px;
  background-color: #FFF;
  opacity: .8;
}
.gallery .thumbnails li img.active {
  border-color: #7B68EE;
  opacity: 1;
}