.topmodal {
    background: #fff;
    display: none;
    margin: auto;
    padding: 20px;
    position: relative;
    max-width: 500px;
    z-index: 10000;
}

.topmodal.is-open {
    display: block;
}

.topmodal-overlay {
    background: rgba(200, 200, 200, 0.9);
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.topmodal-overlay.is-open {
    display: block;
    z-index: 9999;
}