hyperapp-components/src/components/overlay/overlay.css

.overlay {
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    position: fixed;
    z-index: 1;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.contentWrapper {
    position: relative;
    display: flex;
    max-width: 80vw;
    max-height: 80vh;
    margin: auto;
    padding: 1em;
    color: initial;
    background: #FFF;
    box-shadow: 0 0 4px #666;
}