.containerthumbnail {
    position: relative;
    width: 50%;
}

.imagethumbnail {
    opacity: 1;
    display: block;
    width: 100%;
    height: auto;
    transition: .5s ease;
    backface-visibility: hidden;
    border-radius: 12px;
}

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

.containerthumbnail:hover .imagethumbnail {
    opacity: 0.3;
}

.containerthumbnail:hover .middlethumbnail {
    opacity: 1;
}

.textthumbnail {
    background-color: #04AA6D;
    color: white;
    font-size: 16px;
    padding: 16px 32px;
}

.modal-content {
    background-color: #57575c !important;
}

.modal-header {
    background-color: #252526;
    color: white;
}

.btn-close, .btn-close:hover, .btn-close:active, .btn-close:visited {
    background-color: #FFFFFF !important;
}