chromium/chrome/browser/resources/chromeos/set_time_dialog/set_time_dialog.html

      <style include="cr-page-host-style cr-shared-style md-select cros-color-overrides">
        :host {
          user-select: none;
        }

        cr-dialog::part(dialog) {
          border-radius: 0;
          height: 100%;
          width: 100%;
        }

        cr-dialog [slot=button-container] {
          /* Align right edge of "Done" button with right edge of time input. */
          padding-inline-end: 20px;
        }

        .row {
          display: flex;
          margin-top: 16px;
        }

        div.row:first-of-type {
          margin-top: 0;
        }

        .column {
          flex: 1;
        }

        /* Style to match <cros-textfield>. */
        input[type='date'],
        input[type='time'] {
          background-color: var(--cros-sys-input_field_on_base);
          border: none;
          border-radius: 8px;
          box-sizing: border-box;
          color: var(--cros-sys-on_surface);
          font: var(--cros-body-2-font);
          height: 36px;
          /* Ensure space for focus border. */
          margin-bottom: 2px;
          padding-inline-end: 16px;
          padding-inline-start: 16px;
          width: 100%;
        }

        input[type='date']:focus,
        input[type='time']:focus {
          outline: 2px solid var(--cros-sys-focus_ring);
        }

        input[type='date']::-webkit-clear-button,
        input[type='time']::-webkit-clear-button {
          display: none;
        }

        #timeColumn {
          margin-inline-start: 20px;
        }

        #timezone {
          display: block;
          /* No bottom margin to minimize height of dialog body. */
          margin-bottom: 0;
        }

        #timezoneSelect {
          cursor: default;
          font-family: inherit;
          font-size: inherit;
          /* Ensure space for focus border. */
          margin-bottom: 2px;
          width: 100%;
        }
      </style>

      <cr-dialog id="dialog">
        <div slot="title">$i18n{setTimeTitle}</div>
        <div slot="body" id="dialogBody">
          <div class="row">$i18n{prompt}</div>

          <div class="row">
            <div class="column">
              <div id="label">$i18n{dateLabel}</div>
              <input id="dateInput" type="date" aria-label="$i18n{dateLabel}"
                  min="[[minDate_]]" max="[[maxDate_]]" on-blur="onInputBlur_">
            </div>
            <div class="column" id="timeColumn">
              <div id="label">$i18n{timeLabel}</div>
              <input id="timeInput" type="time" aria-label="$i18n{timeLabel}"
                  on-blur="onInputBlur_">
            </div>
          </div>

          <template is="dom-if" if="[[isTimezoneVisible_]]">
            <div id="timezone" class="row">
              <div id="label">$i18n{timezoneLabel}</div>
              <select id="timezoneSelect"
                  class="md-select"
                  aria-label="$i18n{timezoneLabel}"
                  on-change="onTimezoneChange_">
                <template is="dom-repeat" items="[[timezoneItems_]]" as="tz">
                  <option value="[[tz.id]]" selected="[[tz.selected]]">
                    [[tz.name]]
                  </option>
                </template>
              </select>
            </div>
          </template>
        </div>

        <div slot="button-container">
          <cr-button id="doneButton" class="action-button"
              on-click="onDoneClick_">
            $i18n{doneButton}
          </cr-button>
        </div>
      </cr-dialog>