.portal-title {
    position: absolute;
    bottom: 0;
    left: 0;
    padding-bottom: 15px;
    padding-left: 20px;
    width: 100%;
    height: 100%;
    border-radius: 5px;
    background: linear-gradient(0, rgba(0, 0, 0, 0.5), transparent);
    color: #fff;
    font-weight: 700;
    line-height: 24px;
    text-align: left;
    display: flex;
    align-items: flex-end;
}

.block {
    position: absolute;
    z-index: 30;
    top: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 16px 15px 16px 20px;
    color: #fff;
    text-align: left;
    font-size: 14px;
    line-height: 1.5;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 5px;

    opacity: 0;
    visibility: hidden;
    pointer-events: none;

    transition: opacity 1s ease, visibility 1s ease;
}

.card:hover .block {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.card:hover .portal-title {
    opacity: 0;
}