.img-replace {
        /* replace text with an image */
        display: inline-block;
        overflow: hidden;
        text-indent: 100%; 
        color: transparent;
        white-space: nowrap;
    }
    .bts-popup {
        position: fixed;
        z-index: 4;
        left: 0;
        top: 0;
        height: 100%;
        width: 100%;
        background-color: rgba(0, 0, 0, 0.3);
        backdrop-filter: blur(15px);
        opacity: 0;
        visibility: hidden;
        -webkit-transition: opacity 0.3s 0s, visibility 0s 0.3s;
        -moz-transition: opacity 0.3s 0s, visibility 0s 0.3s;
        transition: opacity 0.3s 0s, visibility 0s 0.3s;
    }
    .bts-popup.is-visible {
        opacity: 1;
        visibility: visible;
        -webkit-transition: opacity 0.3s 0s, visibility 0s 0s;
        -moz-transition: opacity 0.3s 0s, visibility 0s 0s;
        transition: opacity 0.3s 0s, visibility 0s 0s;
    }

    .bts-popup-container {
        display: block;
        margin-left: auto;
        margin-right: auto;
        margin-top: 100px;
        position: relative;
        z-index: 3;
        width: 90%;
        max-width: 600px;
        text-align: center;
        box-shadow: 0 0 2px rgba(0, 0, 0, 0.2);
        -webkit-transform: translateY(-40px);
        -moz-transform: translateY(-40px);
        -ms-transform: translateY(-40px);
        -o-transform: translateY(-40px);
        transform: translateY(-40px);
        /* Force Hardware Acceleration in WebKit */
        -webkit-backface-visibility: hidden;
        -webkit-transition-property: -webkit-transform;
        -moz-transition-property: -moz-transform;
        transition-property: transform;
        -webkit-transition-duration: 0.3s;
        -moz-transition-duration: 0.3s;
        transition-duration: 0.3s;
        border: 6px solid #ffffff;
        border-radius: 15px;
    }
    .bts-popup-container img {
        padding: 0px;
        vertical-align: middle;
        border-radius: 9px;
        position: relative;
    }
    .bts-popup-container p {
        color: white;
        padding: 10px 40px;
    }
    .bts-popup-container .bts-popup-button {
        padding: 5px 25px;
        border: 2px solid white;
        display: inline-block;
        margin-bottom: 10px;
    }

    .bts-popup-container a {
        color: white;
        text-decoration: none;
        text-transform: uppercase;
    }
    .bts-popup-container .bts-popup-close {
        position: absolute;
        top: 8px;
        right: 8px;
        width: 30px;
        height: 30px;
    }
    .bts-popup-container .bts-popup-close::before, .bts-popup-container .bts-popup-close::after {
        content: '';
        position: absolute;
        top: 12px;
        background-color: rgb(213, 0, 0);
        font-family: 'Roboto', sans-serif;
    }
    .bts-popup-container .bts-popup-close::before {
        -webkit-transform: rotate(45deg);
        -moz-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
        -o-transform: rotate(45deg);
        transform: rotate(45deg);
        left: 8px;
    }
    .bts-popup-container .bts-popup-close::after {
        -webkit-transform: rotate(-45deg);
        -moz-transform: rotate(-45deg);
        -ms-transform: rotate(-45deg);
        -o-transform: rotate(-45deg);
        transform: rotate(-45deg);
        right: 6px;
        top: 13px;
    }
    .is-visible .bts-popup-container {
        -webkit-transform: translateY(0);
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        -o-transform: translateY(0);
        transform: translateY(0);
    }