.tab {
  border-color: #fff !important;
}
.img_element {
  float: left;
  padding-top: 10px;
  padding-left: 10px;
  padding-right: 10px;
  padding-bottom: 10px;
}
.inline-block {
  display: inline-block;
}
.tab_selected {
  color: #337ab7 !important;
}
.image_selected {
  opacity: 0.5;
  border: solid #000 1px;
}
.image_border {
  border: solid #000 1px;
}
.insert {
  max-height: calc(100vh - 380px);
  overflow: auto;
  margin-top: 40px;
}
@media (max-width: 2450px) {
  .insert {
    max-height: calc(100vh - 380px);
    overflow: auto;
    margin-top: 40px;
  }
}
.img_grid {
  display: grid;
}
.img_container {
  position: relative;
  float: left;
}
.imagess {
  opacity: 1;
  display: block;
  width: 100%;
  height: auto;
  transition: .5s ease;
  backface-visibility: hidden;
}
.img_middle {
  transition: .5s ease;
  opacity: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
  width: 100%;
  height: auto;
}
.img_container:hover .img_middle {
  opacity: 1;
}