chrome/browser/resources/chromeos/cloud_upload/file_handler_page.html

<style>
  #dialog {
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 379px;
    width: 512px;
  }

  #dialog:focus-visible {
    outline: none;
  }

  #title {
    color: var(--cros-sys-on_surface);
    font: var(--cros-headline-1-font);
    /* override the default margin for H1. */
    margin: 0;
    padding-block-end: 8px;
    padding-block-start: 24px;
    padding-inline: 24px;
  }

  #content {
    border-top: 1px solid transparent;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow: scroll;
    padding-inline: 24px;
  }

  #content.separator-top {
    border-top: 1px solid var(--cros-separator-color);
  }

  #content.fade-bottom::after {
    background: linear-gradient(transparent 0,
                                var(--cros-sys-app_base) 100%);
    bottom: 88px;  /* button container + padding */
    content: '';
    height: 20px;
    left: 0;
    pointer-events: none;
    position: absolute;
    width: 100%;
  }

  @media (prefers-color-scheme: dark) {
    #content.fade-bottom::after {
      background: linear-gradient(transparent 0,
                                  var(--cros-bg-color-elevation-3) 100%);
    }
  }

  #button-container {
    display: flex;
    justify-content: flex-end;
    padding-block-end: 24px;
    padding-block-start: 32px;
    padding-inline: 24px;
  }

  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>

<!-- autofocus for screen reader to read header on dialog open-->
<div id="dialog" role="dialog" autofocus tabindex="-1" aria-labelledby="title">
  <div id="header">
    <h1 id="title"></h1>
  </div>
  <div id="content" role="listbox" aria-multiselectable="false" tabindex="-1"
    aria-label="Application options"></div>
  <div id="button-container">
    <cr-button class="cancel-button">$i18n{cancel}</cr-button>
    <cr-button class="action-button">$i18n{open}</cr-button>
  </div>
</div>