body {
    line-height: unset;
}

#main_page {
/* display: inline-flex; */
  display: flex;
  flex-direction: column;
  min-height: 100vh;       /* body takes whole viewport's height */
  max-width: 100%;
  padding: 0 0;
}

#main_content {
    display: flex;
height: 10px; flex: 1; overflow: auto; margin: 0;
}

iframe.uumap {
    height: calc(100% - 150px);
    flex: 1;
    overflow: auto;
    position: absolute; 
    border: none;
}

div#footer {
    margin: auto;
}