body {
        font-family: Arial, sans-serif;
        background-color: #f4f4f4;
        margin: 0;
        padding: 20px;
    }

    form {
        background: #fff;
        padding: 20px;
        border-radius: 5px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        max-width: 400px;
        margin: auto;
    }

    label {
        display: block;
        margin-bottom: 5px;
        font-weight: bold;
    }
     .alert {
            color: red; /* رنگ قرمز */
        }

    input[type="text"],
    input[type="number"] {
        width: 100%;
        padding: 10px;
        margin-bottom: 15px;
        border: 1px solid #ccc;
        border-radius: 4px;
        box-sizing: border-box;
    }

    input[type="submit"] {
        background-color: #4CAF50;
        color: white;
        padding: 10px;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        width: 100%;
    }

    input[type="submit"]:hover {
        background-color: #45a049;
    }
    table {
            margin: 20px auto;
            border-collapse: collapse;
            width: 80%;
            text-align: center;
            /* مرکز چین کردن محتوا */
        }
    
        th,
        td {
            border: 1px solid #ddd;
            padding: 10px;
        }
    
        th {
            background-color: #f2f2f2;
        }
    
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
    
        tr:hover {
            background-color: #f1f1f1;
        }