* {
    box-sizing: border-box;
  }
  
  html, body {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
    border: 0;
    padding: 0;
    overflow: hidden;
    user-select: none;
  }
  
  body {
    font-family: 'Noto Sans', sans-serif;
    color: white;
  }
  
  #cover-image {
    z-index: 1;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    /* Fallback if background image failed to load.*/
    background-color: #333;
    transition: opacity 1s linear;
  }
  
  #walk-canvas {
    width: 0;
    height: 0;
    touch-action: none;
  }
  
  .message {
    z-index: 300;
    position: absolute;
    width: 260px;
    top: 0;
    left: 0;
    padding: 1em;
    background-color: white;
    color: black;
    font-size: 16px;
    text-align: center;
  }
  .message > a {
    color: black;
  }
  .info-message {
    border: 2px solid yellow;
  }
  .error-message {
    border: 2px solid red;
  }
  
  .ui-panel {
    background-color: rgba(0, 0, 0, 0.6);
    font-size: 13px;
  }
  .ui-hoverable:hover {
    background: rgb(0, 0, 0);
  }
  
  .ui-close-hoverable:hover {
    background: rgb(80, 0, 0);
  }
  
  /* Reponsive UI dimensions and positions - large display */
  .ui-top {
    top: 10px;
  }
  .ui-bottom {
    bottom: 10px;
  }
  .ui-left {
    left: 10px;
  }
  .ui-right {
    right: 10px;
  }
  .ui-center {
    left: 50%;
    transform: translate(-50%, 0);
  }
  
  .ui-all-center {
    left: 50%;
    top: 35%;
    transform: translate(-50%, -50%);
  }
  
  .info-item {
    min-width: 60px;
    height: 60px;
  }
  .menu-item {
    min-width: 52px;
    height: 52px;
    padding: 13px 6px 13px 6px;
    line-height: 26px;
  }
  .menu-item > img {
    padding: 2px 0 1px 0;
  }
  .menu-button {
    font-size: 26px;
  }
  #secondary-progress-done {
    height: 8px;
  }
  #engine-logo {
    padding-top: 8px;
    padding-bottom: 8px;
    line-height: 34px;
  }
  #view-list-items {
    /* Make view-list not higher than half of the viewport:
         50vh + view_margin - ui_margin - (folder_margin + folder_height) */
    max-height: calc(50vh + 2px - 10px - (4px + 14px));
  }
  #view-list-items::-webkit-scrollbar,
  #view-list-items::-webkit-scrollbar-thumb {
    width: 6px;
  }
  .ext-popup-content {
    /* 100vw - ui_margin - (ui_margin + close_button) */
    max-width: calc(100vw - 10px - (10px + 30px));
    /* 100vh - 2 * ui_margin */
    max-height: calc(100vh - 2 * 10px);
    padding: 12px;
    font-size: 14px;
  }
  #ext-html-label-content img,
  #ext-html-label-content video,
  #ext-html-label-content iframe {
    /* By default prevent img, video and iframe (often embedding videos) from
       overflowing the screen: 100vh - 2 * ui_margin - 2 * popup_padding -
       4px (- 4px as an error margin for browser's layout computations). */
    max-height: calc(100vh - 2 * 10px - 2 * 12px - 4px);
  }
  
  /* Reponsive UI dimensions and positions - small display */
  @media (max-width: 639px), (max-height: 639px) {
    .ui-panel {
      font-size: 12px;
    }
    .ui-top {
      top: 5px;
    }
    .ui-bottom {
      bottom: 5px;
    }
    .ui-left {
     left: 5px;
    }
    .ui-right {
      right: 5px;
    }
    .info-item {
      min-width: 46px;
      height: 46px;
    }
    .menu-item {
      min-width: 42px;
      height: 42px;
      padding: 11px 6px 11px 6px;
      line-height: 20px;
    }
    .menu-item > img {
      padding: 2px 0 0 0;
    }
    .menu-button {
      font-size: 22px;
    }
    #secondary-progress-done {
      height: 4px;
    }
    #engine-logo {
      padding-top: 6px;
      padding-bottom: 6px;
      line-height: 30px;
    }
    #view-list-items {
      max-height: calc(50vh + 2px - 5px - (4px + 14px));
    }
    @media (min-width: 560px) and (max-height: 439px) {
      #view-list-items {
        /* If the small display is low but wide make the view-list taller:
             80vh + view_margin - ui_margin - (folder_margin + folder_height) -
               (ui_margin + menu_bar_height + ui_margin) - webkit_ui_height
           We use 80vh instead of 100vh because on mobile WebKit 100vh includes
           the browser UI.
         */
        max-height: calc(80vh + 2px - 5px - (4px + 14px) - (5px + 42px + 5px));
      }
    }
    #view-list-items::-webkit-scrollbar,
    #view-list-items::-webkit-scrollbar-thumb {
      width: 4px;
    }
    .ext-popup-content {
      max-width: calc(100vw - 5px - (5px + 30px));
      max-height: calc(80vh - 5px - 5px);
      padding: 8px;
      font-size: 12px;
    }
    #ext-html-label-content img,
    #ext-html-label-content video,
    #ext-html-label-content iframe {
      max-height: calc(80vh - 2 * 5px - 2 * 8px - 4px);
    }
  }
  
  .absolute-center {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    /* For IE9: */
    -ms-transform: translateX(-50%) translateY(-50%);
  }
  
  #info-bar {
    z-index: 100;
    position: absolute;
    overflow: hidden;
    user-select: text;
  }
  #info-bar-slide {
    position: relative;
    left: 0;
    transition: left 1s ease;
  }
  #author-logo {
    display: inline-block;
    margin-right: 2px;
    background: none;
    text-align: center;
  }
  #author-logo > img {
    height: 100%;
  }
  #info-text {
    display: inline-block;
    padding: 5px 10px 3px 10px;
    vertical-align: top;
  }
  #info-text > div {
    display: table;
    height: 50%;
  }
  #info-title, #info-author {
    display: table-cell;
    height: 100%;
    line-height: 1;
    vertical-align: middle;
    /* For <a> */
    color: white;
    text-decoration: none;
  }
  #info-title {
    font-size: 1.4em;
  }
  
  #menu-bar {
    z-index: 102;
    position: absolute;
    /* overflow: hidden; */
  }
  #threeD-floorplan-button{
      position: relative;
  }
  #sub_menu div{
      display: block;
      padding: 10px 10px;
  }
  #threeD-floorplan-button:hover > #sub_menu {display: block;}
  #sub_menu:after ,#sub_menu  div:after{display: none;}
  #sub_menu{
    display: none;
    width: 120px;
    background-color: #000000cc;
    position: absolute;
    bottom: 42px;
    left: -10px;
  }
  #menu-bar-slide {
    position: relative;
    right: 0;
    transition: right 1s ease;
  }
  .menu-item {
    display: inline-block;
    margin-left: 2px;
    vertical-align: top;
    text-align: center;
    cursor: pointer;
  }
  .menu-item > img {
    height: 100%;
    vertical-align: top;
  }
  #menu-bar-content {
    display: inline-block;
    padding-left: 2px;
  }
  #menu-bar-folder {
    min-width: 0px;
    width: 16px;
    padding-left: 6px;
    padding-right: 5px;
  }
  #menu-bar-folder > img {
    width: 100%;
    transition: transform 1s ease;
  }
  #menu-buttons {
    display: inline-block;
  }
  .menu-button {
    font-weight: 700;
  }
  #engine-logo {
    color: white;
    text-decoration: none;
  }
  #engine-logo-text {
    display: inline-block;
    margin-right: 6px;
    vertical-align: top;
  }
  #view-list {
    z-index: 101;
    position: absolute;
    overflow: hidden;
  }
  #view-list-slide {
    position: relative;
    top: 0;
    transition: top 1s ease;
  }
  #view-list-items {
    /* Negative margin to compensate for the first view having margin-top: 2px */
    margin-top: -2px;
    margin-bottom: 4px;
    overflow-x: hidden;
    scrollbar-width: auto;
    scrollbar-color: white rgba(0, 0, 0, 0.6);
    -ms-overflow-style: -ms-autohiding-scrollbar;
  }
  #view-list-items::-webkit-scrollbar {
    background-color: rgba(0, 0, 0, 0.6);
    width: 10px;
  }
  #view-list-items::-webkit-scrollbar-thumb {
    background-color: white;
    border-radius: 5px;
  }
  .view {
    padding: 3px 18px 3px 9px;
    margin-top: 2px;
    line-height: 1.5;
    white-space: nowrap;
    cursor: pointer;
  }
  #view-list-folder {
    height: 14px;
    padding-top: 5px;
    padding-bottom: 4px;
    text-align: center;
    cursor: pointer;
  }
  #view-list-folder > img {
    /* Using height: 100% does not work on Safari, so set height in pixels. */
    height: 5px;
    vertical-align: top;
  }
  
  #play-button {
    z-index: 200;
    max-width: 30vw;
    max-height: 35vh;
    cursor: pointer;
  }
  
  #help-and-primary-progress {
    z-index: 200;
    text-align: center;
  }
  
  .help {
    /* Such vertical margins here and in #primary-progress introduce
       5vh margin between the help and the progress indicator when they
       are shown together, while maintaining the vertical centering of these
       elements when they are shown stand-alone. */
    margin: 2.5vh auto;
    padding: 16px;
    font-size: 13px;
  }
  .close-help-button {
    float: right;
    width: 32px;
    height: 32px;
    padding: 6px;
    /* Negative margin to compensate for the hoverable padding */
    margin: -6px 0 -6px 0;
    cursor: pointer;
  }
  .help-columns {
    display: table;
    width: 100%;
    text-align: center;
  }
  .help-column3, .help-column3-sep, .help-column2, .help-column2-sep {
    display: table-cell;
    vertical-align: middle;
  }
  .help-column3 {
    width: 26%;
  }
  .help-column3-sep {
    width: 11%;
  }
  .help-column2 {
    width: 45%;
  }
  .help-column2-sep {
    width: 10%;
  }
  
  #desktop-help {
    width: 500px;
  }
  #desktop-help-switch {
    padding-left: 25%;
    width: 75%;
    font-size: 14px;
    text-align: center;
  }
  #desktop-help-switch > div {
    display: inline-block;
    width: 50%;
    border: 2px solid #4676cc;
    cursor: pointer;
  }
  #desktop-help-switch > div:nth-child(1) {
    border-right-width: 1px;
  }
  #desktop-help-switch > div:nth-child(2) {
    border-left-width: 1px;
  }
  #desktop-help-switch > div:hover {
    background-color: #23b5e9;
  }
  #desktop-help-switch > div.selected,
  #desktop-help-switch > div.selected:hover {
    background-color: #3c66b0;
  }
  
  #desktop-basic-help h1 {
    margin-top: 24px;
    margin-bottom: 18px;
    font-size: 20px;
    font-weight: 700;
  }
  #desktop-basic-help img {
    height: 60px;
  }
  
  #advanced-desktop-help {
    max-height: calc(100vh - 200px);
    margin-top: 8px;
    overflow-y: auto;
    font-size: 12px;
  }
  #advanced-desktop-help h1 {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
  }
  .help-how, .help-what {
    display: inline-block;
    width: 50%;
    padding: 4px 0;
    vertical-align: middle;
  }
  .help-how {
    padding-right: 5%;
    text-align: right;
  }
  .help-what {
    padding-left: 5%;
  }
  .help-key, .help-key-placeholder {
    display: inline-block;
    min-width: 22px;
    margin: 1px;
  }
  .help-key {
    line-height: 20px;
    padding: 0 4px;
    border: 1px solid;
    border-radius: 4px;
    text-align: center;
  }
  
  #mobile-help {
    width: 300px;
  }
  #mobile-help h1 {
    margin-top: 8px;
    margin-bottom: 14px;
    font-size: 16px;
    font-weight: 700;
  }
  #mobile-help img {
    height: 50px;
  }
  
  #primary-progress {
    /* z-index set to 200 for compatibility with customized indexes based on
       webwalk < 180, because previously #primary-progress was a top-level
       element. */
    z-index: 200;
    margin-top: 2.5vh;
    margin-bottom: 2.5vh;
    width: 25vw;
    max-height: 20vh;
    transition: opacity 0.5s linear;
  }
  #primary-progress > circle {
    fill: none;
  }
  #primary-progress > circle:nth-child(1) {
    stroke: rgba(0, 0, 0, 0.6);
  }
  #primary-progress-done {
    stroke: #3c66b0;
  }
  
  #secondary-progress {
    z-index: 200;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    transition: opacity 0.5s linear;
  }
  #secondary-progress-done {
    width: 0px;
    background-color: #3c66b0;
  }
  
  .tour-on {
    animation: blinker 1s linear infinite;
  }
  
  @keyframes blinker {
    50% { opacity: 0; }
  }
  
  .active-view, .active-view:hover {
    background-color: #3c66b0;
  }
  
  .next-active-view, .next-active-view:hover {
    background-color: #284461;
  }
  
  .ext-popup {
    z-index: 104;
    position: absolute;
    white-space: nowrap;
  }
  .ext-popup-content {
    display: inline-block;
    vertical-align: top;
    overflow: auto;
    /* A bit darker than .ui-panel because large pop-ups often overlap with some
       UI elements */
    background-color: rgba(0, 0, 0, 0.8);
    white-space: normal;
  }
  .ext-popup-close-button-panel {
    display: inline-block;
    margin-left: 4px;
    padding: 6px;
    background-color: rgba(0, 0, 0, 0.8);
    line-height: 0;
  }
  .ext-popup-close-button {
    width: 18px;
    height: 18px;
    background-size: cover;
    cursor: pointer;
  }
  
  #ext-html-label-content {
    user-select: text;
  }
  
  #ext-html-label-content a {
    color:#5cc2e6;
    font-weight: 700;
    text-decoration: none;
  }
  
  #ext-html-label-content img,
  #ext-html-label-content video {
    max-width: 75vw;
  }
  #ext-html-label-content iframe {
    /* By default show iframes in 16:9 aspect ratio, suitable for video embeds. */
    width: 75vw;
    height: calc(75vw / 16 * 9);
    border: 0;
  }
  
  #ext-html-label-content video,
  #ext-html-label-content iframe {
    /* By default prevent videos and iframes (often embedding videos) from
       overflowing the screen. */
    max-height: 75vh;
  }
  
  #ext-meeting-status-footer {
    padding-top: 25px;
  }
  
  .ext-meeting-button {
    display: inline-block;
    min-width: 40px;
    border: 2px solid #3c66b0;
    background-color: #4676cc;
    cursor: pointer;
    color: white;
  }
  .ext-meeting-button:hover {
    background-color: #3c66b0;
  }
  .ext-meeting-button:focus {
    outline-color: #627fb3;
    outline-style: solid;
    outline-width: 2px;
  }
  
  .ext-meeting-button-highlight {
    border: 2px solid #a32929;
    background-color: #cc3333;
  }
  .ext-meeting-button-highlight:hover {
    background-color: #a32929;
  }
  .ext-meeting-button-highlight:focus {
    outline-color: #d65c5c;
  }
  
  .ext-meeting-right {
    float: right;
  }
  
  .ext-meeting-join-row + .ext-meeting-join-row {
    overflow: hidden;
    margin-top: 8px;
  }
  
  .ext-meeting-join-label {
    display: inline-block;
    width: 80px;
  }
  
  .ext-meeting-dialog-buttons {
    display: block;
    float: right;
    overflow: hidden;
  }
  
  .ext-meeting-dialog-buttons > button {
    margin-top: 16px;
  }
  
  .ext-meeting-dialog-ok {
    margin-right: 8px;
  }
  
  #ext-meeting-join-name {
    width: 180px;
  }
  
  .ext-meeting-join-settings {
    display: inline-block;
  }
  
  .ext-meeting-join-center {
    text-align: center;
  }
  
  .ext-meeting-join-footer {
    max-width: 260px;
    padding-top: 8px;
    font-size: smaller;
  }
  
  .ext-meeting-join-footer > a {
    color: white;
  }
  
  .ext-meeting-input-missing {
    background-color: #ff4136;
  }
  
  .ext-meeting-list {
    padding-left: 16px;
    margin-top: 4px;
  }
  
  .ext-meeting-list-entry {
    min-width: 52px;
  }
  .ext-meeting-list-name {
    margin-right: 3px;
  }
  .ext-meeting-list-mic-indicator {
    display: inline-block;
    min-width: 1.3em;
    margin-left: 2px;
    color: #bbb;
    font-size: 0.85em;
    text-align: center;
  }
  .ext-meeting-note-entry > span {
    float: right;
  }
  
  #ext-meeting-join-button {
    padding: 4px 8px;
    margin-top: 8px;
    margin-bottom: 8px;
  }
  
  #ext-meeting-note-list {
    max-height: 60vh;
    overflow:hidden;
    overflow-y:scroll;
    scrollbar-width: auto;
    scrollbar-color: white rgba(0, 0, 0, 0.6);
    -ms-overflow-style: -ms-autohiding-scrollbar;
  }
  #ext-meeting-note-list::-webkit-scrollbar {
    background-color: rgba(0, 0, 0, 0.6);
    width: 10px;
  }
  #ext-meeting-note-list::-webkit-scrollbar-thumb {
    background-color: white;
    border-radius: 5px;
  }
  
  #ext-meeting-note-list > li {
    padding-right: 20px;
  }
  
  .ext-meeting-note-entry {
    padding-left: 0.5em;
    padding-right: 0.5em;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
  }
  
  .ext-meeting-note-list-unread {
    color: #ff8c00;
  }
  
  .ext-meeting-note-list-selected {
    color: #01c47f;
  }
  
  .ext-meeting-note-unread {
    border-left: 2px solid #ff8c00;
    margin-left: -2px;
  }
  
  #ext-meeting-note-text {
    height: 5em;
    width: 40em;
    margin-bottom: 1em;
    font-family: inherit;
    font-size: inherit;
  }
  
  #ext-meeting-camera-preview {
    position: absolute;
    bottom: 0;
    left: 0;
    padding: 4px;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 100;
  }
  
  #ext-meeting-camera-preview > video {
    display: block;
    max-width: 40vw;
    max-height: 25vh;
    transform: scaleX(-1);
  }
  
  .fa-microphone::before {
   font-family: 'FontAwesomeSolid';
   content: "\f130";
  }
  .fa-microphone-slash::before {
   font-family: 'FontAwesomeSolid';
   content: "\f131";
  }
  .fa-video::before {
   font-family: 'FontAwesomeSolid';
   content: "\f03d";
  }
  .fa-video-slash::before {
   font-family: 'FontAwesomeSolid';
   content: "\f4e2";
  }
  .fa-hand-pointer::before {
   font-family: 'FontAwesomeRegular';
   content: "\f25a";
  }
  
  .ui-blur {
    pointer-events: none;
    filter: blur(2px) opacity(0.4);
    transition: 1s;
  }
  .ui-unblur {
    filter: none;
    transition: 1s;
  }
  
  .ui-foremost {
    z-index: 400;
  }