html, body {
      width: 100%;
      height: 100%;
      margin: 0;
      background: #008080;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: "MS Sans Serif", Tahoma, sans-serif;
    }

    .window {
      width: 420px;
    }

    .logo {
      font-size: 28px;
      font-weight: bold;
      text-align: center;
      letter-spacing: 3px;
      margin-bottom: 4px;
    }

    .subtitle {
      text-align: center;
      font-size: 12px;
      color: #404040;
      margin-bottom: 12px;
    }

    .os-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
    }

    .os-entry {
      border: 2px solid #808080;
      padding: 8px;
      cursor: pointer;
    }

    .os-entry:hover {
      background: #000080;
      color: white;
    }

    .os-title {
      font-weight: bold;
      font-size: 13px;
    }

    .os-desc {
      font-size: 11px;
      color: #404040;
    }

    .os-entry:hover .os-desc {
      color: #c0c0c0;
    }

    .footer {
      margin-top: 12px;
      font-size: 11px;
      text-align: center;
      color: #404040;
    }