.article-container { position: relative;
    width: 60%; margin: 0 auto;
}
.image-article {
  opacity: 1;
  display: block;
  width: 100%;
  height: auto;
  transition: .5s ease;
  backface-visibility: hidden;
}

.middle {
  transition: .5s ease;
  opacity: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%)
}

.article-container:hover .image-article {
  opacity: 0.3;
}

.article-container:hover .middle {
  opacity: 1;
}

.text {
  background-color: #00adb5;
  color: white;
  font-size: 16px;
  padding: 16px 32px;
}
.img-thumbnail:hover {
 border: 1px solid rgba(0, 173, 181, 1) !important; 

}

/* Tablet */
@media(min-width: 768px){


}

/* Desktop */
@media(min-width:992px){


}

/* Large Desktop */
@media(min-width:1200px){



}