yle>
  <script>
    function getOSByUA() {
      const ua = navigator.userAgent.toLowerCase()
      if (ua.includes("mac os x")) {
        return "mac"
      } else if (ua.includes("linux")) {
        return "linux"
      } else if (ua.includes("windows")) {
        return "windows"
      }
      return "unknown"
    }
    const root = window.document.documentElement;
    root.classList.add('dark');
    if(getOSByUA() === 'linux'){
      root.style.border = '2px solid #333333';
    }
    // const mediaQuery