chromium/ash/webui/diagnostics_ui/resources/diagnostics_card_frame.html

<style include="diagnostics-shared">
  :host-context(body.jelly-enabled) ::slotted([slot=title]) {
    font: var(--cros-button-1-font);
  }

  :host-context(body.jelly-enabled) .card-wrapper {
    border-radius: 16px;
    box-shadow: none;
  }

  ::slotted([slot=chip]) {
    background-color: var(--diagnostics-chip-bg-color);
    border-radius: 16px;
  }

  ::slotted([slot=title]) {
    color: var(--cros-text-color-secondary);
    font-family: var(--diagnostics-roboto-font-family);
    font-size: 14px;
    font-weight: var(--diagnostics-medium-font-weight);
  }

  ::slotted([slot=left-panel]) {
    flex: 1;
    margin-bottom: 16px;
  }

  .card-container {
    display: flex;
    flex-direction: column;
    margin: 12px 0 12px;
  }

  .card-header {
    display: flex;
    height: 20px;
    justify-content: space-between;
    padding-top: 10px;
  }

  .card-wrapper {
    background-color: var(--diagnostics-card-bg-color);
    border-radius: 4px;
    box-shadow: var(--diagnostics-box-shadow);
    margin: 10px 0;
  }
</style>
<div class="card-container">
  <div id="title" class="card-header">
    <slot name="title"></slot>
    <slot name="chip"></slot>
  </div>
  <div class="card-wrapper">
    <slot name="contents"></slot>
  </div>
</div>