.parallax {
    /* background-image: url("/app/main/static/images/main_page_background.jpg"); */
    min-height: 400px; 
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.parallax-sm {
    /* background-image: url("main/static/images/main_page_background.jpg"); */
    min-height: 50px; 
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.parallax-md {
    /* background-image: url("../main/static/images/main_page_background.jpg"); */
    min-height: 200px; 
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.modal-open .container-fluid, .modal-open  .container {
    -webkit-filter: blur(5px) grayscale(90%);
}