chromium/chrome/browser/resources/chromeos/cloud_upload/office_pwa_install_page.html

<style>
  .icon-button::before {
    -webkit-mask-position: center;
    background-color: currentColor;
    content: ' ';
    display: inline-block;
    height: 20px;
    margin-inline-end: 8px;
    width: 20px;
  }

  .install::before {
    -webkit-mask-image: url(icons/download.svg);
  }

  .installing::before {
    -webkit-mask-image: url(chrome://resources/images/throbber_medium.svg);
    -webkit-mask-size: 100%;
  }

  .installed::before {
    -webkit-mask-image: url(icons/check.svg);
  }

  cr-button {
    --active-bg: transparent;
    --active-shadow: none;
    --active-shadow-action: none;
    --bg-action: var(--cros-sys-primary);
    --cr-button-height: 36px;
    --disabled-bg-action:
        var(--cros-sys-disabled_container);
    --disabled-bg: var(--cros-sys-disabled_container);;
    --disabled-text-color: var(--cros-sys-disabled);
    /* Use the default bg color as hover color because we
        rely on hoverBackground layer below.  */
    --hover-bg-action: var(--cros-sys-primary);
    --hover-bg-color: var(--cros-sys-primary_container);
    --ink-color: var(--cros-sys-ripple_primary);
    --ripple-opacity-action: 1;
    --ripple-opacity: 1;
    --text-color-action: var(--cros-sys-on_primary);
    --text-color: var(--cros-sys-on_primary_container);
    border: none;
    border-radius: 18px;
    box-shadow: none;
  }

  cr-button.cancel-button {
    background-color: var(--cros-sys-primary_container);
  }

  cr-button.cancel-button:hover::part(hoverBackground) {
    background-color: var(--cros-sys-hover_on_subtle);
    display: block;
  }

  cr-button.action-button:hover::part(hoverBackground) {
    background-color: var(--cros-sys-hover_on_prominent);
    display: block;
  }

  :host-context(.focus-outline-visible) cr-button:focus {
    outline: 2px solid var(--cros-sys-focus_ring);
    outline-offset: 2px;
  }
</style>
<svg slot="header-image" viewBox="0 0 448 200">
  <use href="images/install_office_pwa.svg#EXPORT_image"></use>
</svg>
<div slot="title">$i18n{installPWATitle}</div>
<div slot="body">
  <p>$i18n{installPWABodyText}</p>
</div>
<div slot="button-container">
  <cr-button class="cancel-button">$i18n{cancel}</cr-button>
  <cr-button class="action-button icon-button install">$i18n{install}</cr-button>
</div>