.container__img-holder {
  max-width: 280px;
  display: inline-block;
  vertical-align: top;
  margin-bottom: 20px;
  margin-left: 4px !important;
  cursor: pointer;
}

.container .container__img-holder:nth-child(3n+1) {
  margin-left: 0;
}

.container__img-holder img {
  width: 100%;
  height: 220px;
  display: block;
}


/* Popup Styling */
.img-popup {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(255, 255, 255, .5);
  display: flex;
  justify-content: center;
  align-items: center;
  display: none;
}

.img-popup img {
  max-width:600px;
  width: 100%;
  opacity: 0;
  transform: translateY(-100px);
  -webkit-transform: translateY(-100px);
  -moz-transform: translateY(-100px);
  -ms-transform: translateY(-100px);
  -o-transform: translateY(-100px);
}

.close-btn {
  width: 35px;
  height: 30px;
  display: flex;
  justify-content: center;
  flex-direction: column;
  position: relative;
  bottom: 155px;
  left: 0px;
  cursor: pointer;
}

.close-btn .bar {
  height: 4px;
  background: #333;
}

.close-btn .bar:nth-child(1) {
  transform: rotate(45deg);
}

.close-btn .bar:nth-child(2) {
  transform: translateY(-4px) rotate(-45deg);
}

.opened {
  display: flex;
}

.opened img {
  animation: animatepopup 1s ease-in-out .8s;
  -webkit-animation: animatepopup .3s ease-in-out forwards;
}

@keyframes animatepopup {

  to {
    opacity: 1;
    transform: translateY(0);
    -webkit-transform: translateY(0);
    -moz-transform: translateY(0);
    -ms-transform: translateY(0);
    -o-transform: translateY(0);
  }

}

@media screen and (max-width: 880px) {

  .container .container__img-holder:nth-child(3n+1) {
    margin-left: 16px;
  }

}

.container__img-holder {
    border: #ccc solid 1px !important;
}
.container__img-holder img {
    border-bottom: #ccc solid 1px;
}