govuk-frontend/dist/govuk/components/cookie-banner/template-accepted-confirmation-banner.html

GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

<div class="govuk-cookie-banner" data-nosnippet role="region" aria-label="Cookie banner">
  <div class="govuk-cookie-banner__message govuk-width-container" role="alert">

    <div class="govuk-grid-row">
      <div class="govuk-grid-column-two-thirds">
        <div class="govuk-cookie-banner__content">
          <p class="govuk-body">Your cookie preferences have been saved. You have accepted cookies.</p>
        </div>
      </div>
    </div>

    <div class="govuk-button-group">
      <button type="button" class="govuk-button" data-module="govuk-button">
        Hide cookie message
      </button>
    </div>

  </div>
</div>