chrome/browser/resources/chromeos/crostini_upgrader/app.html

<style>
  #error-log {
      white-space: pre;
  }

  #img-rect-illustration {
    align-self: center;
    height: 180px;
    margin-bottom: 80px;
    width: 448px;
  }

  #img-square-illustration {
    align-self: center;
    height: 180px;
    margin-bottom: 80px;
    width: 180px;
  }

  #icon {
    fill: var(--cros-icon-color-prominent);
    height: 32px;
    margin-top: 28px;
    width: 32px;
  }

  #main {
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 608px;
    justify-content: space-between;
    padding: 0 64px;
    width: 768px;
  }

  #main-title {
    color: var(--cros-text-color-primary);
    font-family: 'Google Sans';
    font-size: 28px;
    line-height: 1;
    margin: 36px 0 14px;
  }

  #status-container {
    color: var(--cros-text-color-secondary);
    flex-grow: 1;
    font-family: Roboto;
    font-size: 13px;
    line-height: 18px;
  }

  #progress-message {
    height: 36px;
  }

  #progress-submessage {
    color: var(--google-grey-600);
    flex-grow: 1;
    font-family: Roboto;
    font-size: 13px;
    line-height: 18px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  paper-progress {
    --paper-progress-active-color: var(--cros-icon-color-prominent);
    --paper-progress-container-color: rgba(var(--google-blue-600-rgb), .24);
    margin-top: 36px;
    width: 100%;
  }

  #log-storage-message {
    color: var(--cros-text-color-secondary);
    flex-grow: 1;
    font-family: Roboto;
    font-size: 13px;
    line-height: 18px;
  }

  #bottom-container {
    text-align: center;
  }

  #button-container {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin: 32px 0;
  }

  a[href] {
    color: var(--cr-link-color);
    text-decoration: none;
  }
</style>

<div id="main">
  <svg id="icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 116 121">
    <path fill-rule="evenodd" d="M33.525 111.127C18.692 103.147 9.128 87.46 8.81 66.719c-1.433.726-3.064.848-4.943.163-5.377-1.96-4.169-8.51-2.197-14.348 1.633-4.835 7.21-8.365 9.942-9.103C17.969 19.072 32.883 0 58 0c25.416 0 40.433 18.285 46.611 43.495 2.8.862 8.129 4.332 9.719 9.04 1.972 5.838 3.18 12.386-2.197 14.347-1.878.685-3.51.563-4.942-.163-.29 20.873-9.852 36.5-24.678 44.438.894.72 1.4 1.651 1.4 2.843 0 3.866 1.882 7-11.913 7-10.067 0-11.785-2.13-11.98-4.447-.668-.422-1.342-1.053-2.02-1.053-.68 0-1.355.682-2.025 1.103C55.76 118.901 53.994 121 44 121c-13.795 0-11.914-3.134-11.914-7 0-1.208.521-2.15 1.439-2.873zM58 107c28.664 0 39-20.35 39-47.4 0-22.444-9.4-43.056-25-46.497C67 12 63.5 24 58 24s-9.5-12-14-10.897C28.334 16.943 19 38.342 19 59.6 19 85.125 29.336 107 58 107zM40 47a6 6 0 110-12 6 6 0 010 12zm36 0a6 6 0 110-12 6 6 0 010 12zm-16.914 3.24l8.234 3.613a2.78 2.78 0 01.934 4.442l-8.188 8.802a2.85 2.85 0 01-4.166-.006l-8.16-8.824a2.77 2.77 0 01.18-3.945c.222-.2.476-.365.75-.487l8.114-3.591a2.856 2.856 0 012.302-.004z"></path>
  </svg>
  <div id="status-container" role="status" aria-atomic="false">
    <div id="main-title">[[getTitle_(state_)]]</div>

    <!-- Prompt message.  Has Learn More link.-->
    <div id="prompt-message" hidden="[[!isState_(state_, State.PROMPT)]]">
      <span>[[getProgressMessage_(state_)]] </span>
      <a href="$i18n{learnMoreUrl}" target="_blank">$i18n{learnMore}</a>
    </div>
    <!-- Progress message. -->
    <div id="progress-message" hidden="[[isProgressMessageHidden_(state_)]]">
      <span>[[getProgressMessage_(state_)]]</span>
      <!-- Progress submessage. -->
      <div id = "progress-submessage"
          hidden="[[!isState_(state_, State.UPGRADING)]]">
        <span>[[lastProgressLine_]]</span>
      </div>
    </div>
    <!-- Progress bar containers. Depending on the current state, only one
      of them is visible. -->
    <div id="backup-progress-bar"  hidden="[[!isState_(state_, State.BACKUP)]]">
      <paper-progress class="progress-bar" value="[[backupProgress_]]">
      </paper-progress>
    </div>
    <div id="restore-progress-bar"
        hidden="[[!isState_(state_, State.RESTORE)]]">
      <paper-progress class="progress-bar" value="[[restoreProgress_]]">
      </paper-progress>
    </div>
    <div id="upgrade-progress-bar"
        hidden="[[!isState_(state_, State.UPGRADING)]]">
      <paper-progress class="progress-bar" indeterminate>
      </paper-progress>
    </div>
    <div id="canceling-progress-bar"
        hidden="[[!isState_(state_, State.CANCELING)]]">
      <paper-progress class="progress-bar" indeterminate></paper-progress>
    </div>
    <div id="upgrade-error-message" hidden="[[isErrorLogsHidden_(state_)]]">
      <textarea id="error-log" rows="20" cols="80" readonly>
        [[getErrorLogs_(state_)]]
      </textarea>
    </div>
  </div>

  <img id="[[getIllustrationStyle_(state_)]]"
      src="[[getIllustrationURI_(state_)]]" alt=""
      hidden="[[hideIllustration_(state_)]]">
  <div id="log-storage-message-error" hidden="[[isLogsMessageHidden_(state_)]]">
    <span>[[getLogMessage_(state_, logFileName_)]]</span>
  </div>
  <div id="backup-checkbox" hidden="[[!isState_(state_, State.PROMPT)]]">
    <cr-checkbox checked="{{backupCheckboxChecked_}}" >
      <p class="checkbox-text">
        $i18n{backupCheckboxMessage}
        <a href="#" on-click="onChangeLocationButtonClick_"
            style="text-decoration: none">
        $i18n{backupChangeLocation}</a>
      </p>
    </cr-checkbox>
  </div>
  <div id="button-container">
    <cr-button id="cancel-button" on-click="onCancelButtonClick_"
        hidden="[[!canCancel_(state_)]]">
      [[getCancelButtonLabel_(state_)]]
    </cr-button>
    <cr-button class="action-button" on-click="onActionButtonClick_"
        aria-describedby="title" aria-details="prompt-message"
        hidden="[[!canDoAction_(state_)]]">
      [[getActionButtonLabel_(state_)]]
    </cr-button>
  </div>
</div>