.jm-modal-no-scroll {
    overflow: hidden !important;
}

.jm-modal-blocker {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

    .jm-modal-blocker > div {
        margin: auto;
        background-color: #fefefe;
        border: 1px solid #888;
    }