.img-popup-grid{
            align-items: flex-start;
            padding: 0px;
    }
    .feature-grid .img-box {
        position: relative;
        overflow: hidden;
    }

    .feature-grid .img-box img {
        width: 100%;
        display: block;
    }

    .feature-grid .img-box .overlay {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        pointer-events: none;
        display: flex;
        justify-content: center;
        align-items: center;

        background: rgba(0, 0, 0, .45);

        opacity: 0;
        transition: 0.3s ease;

        z-index: 10;
    }

    .feature-grid .img-box:hover .overlay {
        opacity: 1;
    }

    .feature-grid .img-box .overlay i {
        color: #fff;
        font-size: 50px;
    }

    .image-big-popup {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, .9);
        display: none;
        justify-content: center;
        align-items: center;
        z-index: 99999;
    }

    .close-image-big {
        position: absolute;
        top: 20px;
        right: 30px;
        color: #fff;
        font-size: 45px;
        font-weight: bold;
        cursor: pointer;
        z-index: 100000;
        /* Important */
        line-height: 1;
    }

    .close-image-big:hover {
        color: #ccc;
    }

    .image-big-popup {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.9);
        z-index: 99999;

        justify-content: center;
        align-items: center;
        flex-direction: column;
    }

    .image-big-popup img {
        max-width: 90%;
        max-height: 80%;
    }

    #imgpopupCaption {
        color: #fff;
        margin-top: 15px;
        font-size: 18px;
    }

    .close-image-big {
        position: fixed;
        /* Use fixed instead of absolute */
        top: 15px;
        right: 25px;
        color: #fff;
        font-size: 55px;
        font-weight: bold;
        cursor: pointer;
        z-index: 100000;
        line-height: 1;
    }