.legacy-map-viewer-container {
    width: calc(100vw - 4em);
    margin: 1em 2em;
    max-width: 100%;
    height: calc(100vh + 0px);
}

/* this caused error changing the colour of the top nav sub-menu from white to grey background. To be removed. */ 
/*.c-header {
    position: inherit;
}*/