body {
      margin: 0;
      padding: 20px;
      background-color: skyblue;
      font-family: Arial, sans-serif;
    }

    .contenedor_public {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
    }

    .anuncio {
      width: 300px;
      height: 300px;
      background-color: #ccc;
      border-radius: 8px;
      overflow: hidden;
      position: relative;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }

    .anuncio img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .anuncio-vacio {
      background: radial-gradient(circle, #555, #111);
      color: white;
      text-align: center;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
      font-weight: bold;
      font-size: 24px;
      text-shadow: 2px 2px 5px black;
    }

    @media (max-width: 640px) {
      .anuncio {
        width: 90%;
        height: auto;
        aspect-ratio: 1/1;
      }
    }