.doc_container {
    position: relative;
    width: 80%;
    
    background-color:gray;
    
}

.doc_image {
    opacity: 1;
    display: block;
    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%);
    text-align: center;
}

.doc_container:hover .doc_image {
    opacity: 0.3;
}

.doc_container:hover .middle {
    opacity: 1;
}

.doc_text {
    background-color:transparent;
    color: white;
    font-weight: bold;
    font-size: 16px;
    padding:  25% 25%; 
}

.doc_caption{
    margin-left: -20%;
}

.active_d{
    background-color: #5271FF;
    color: white;
}