body {
            font-family: Arial, sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            margin: 0;
        }
        .container {
            width: 100%;
            max-width: 800px;
            padding: 20px;
            box-sizing: border-box;
            text-align: center;
        }
        .header {
            margin-bottom: 20px;
        }
        .header h1 {
            margin: 0;
            padding: 0;
        }
        .buscador {
            margin: 20px 0;
        }
        .buscador input[type="text"] {
            padding: 5px;
            width: 200px;
        }
        .buscador button {
            padding: 5px 10px;
            background-color: #007bff;
            color: white;
            border: none;
            cursor: pointer;
        }
        .buscador button:hover {
            background-color: #0056b3;
        }
        .datos-donante {
            display: flex;
            justify-content: space-around;
            margin-top: 20px;
        }
        .datos-donante div {
            flex: 1;
            padding: 10px;
            box-sizing: border-box;
        }
        .serologia-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        .serologia-table th, .serologia-table td {
            border: 1px solid #000;
            padding: 10px;
            text-align: center;
        }
        .serologia-table th {
            background-color: #8b8b8b;
            
          /* Encabezado gris claro */
        }
        .centrado {
            text-align: center;
            margin-top: 5px;
            font-size: 10px;
        }
        .centrado strong {
            font-size: 12px;
        }
        .donante-activo {
            color: green;
        }
        .donante-no-activo {
            color: red;
        }
        .full-width select {
            width: 100%;
            padding: 5px;
            box-sizing: border-box;
        }
        .return-button {
            margin: 20px 0;
            padding: 10px 20px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 20px;
            cursor: pointer;
            font-size: 16px;
        }
        .return-button:hover {
            background-color: #0056b3;
        }