    <style>
        body { 
            font-family: Arial, sans-serif; 
            margin: 20px; 
            max-width: 600px; 
            margin: auto; 
            padding: 10px; 
            box-sizing: border-box;
        }
        .total { 
            font-weight: bold; 
            margin-top: 20px; 
            font-size: 18px; 
        }
        #totalPrice { 
            color: red; 
            font-weight: bold; 
        }
        button { 
            background-color: orange; 
            border: none; 
            padding: 5px 10px; 
            border-radius: 0; 
            cursor: pointer;
            color: white;
            font-size: 16px;
            width: 100%;
            margin-top: 5px;
        }
        button:hover {
            background-color: darkorange;
        }
        select {
            width: 50%; 
            margin-top: 10px;
        }
        ul {
            width: 100%;
            padding: 0;
        }
        li {
            list-style-type: none;
            padding: 10px;
            background: #f4f4f4;
            margin-top: 5px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .remove-btn {
            margin-top: 5px;
            background-color: red;
            color: white;
            padding: 5px;
            border: none;
            cursor: pointer;
            width: auto;
        }
        .remove-btn:hover {
            background-color: darkred;
        }
        /* Popup window style */
        .popup {
            width: 450px;
            height: 450px;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: #fff;
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            display: none;
            overflow-y: auto;
        }
        .popup button {
            width: 100%;
            background-color: green;
            border-radius: 10px;
            margin-top: 15px;
        }
        .popup button:hover {
            background-color: darkgreen;
        }
        /* Kapatma butonu stili */
        .close-btn {
            background-color: red;
            color: white;
            border: none;
            padding: 5px;
            cursor: pointer;
            margin-top: 10px;
            border-radius: 10px;
            width: 100%;
        }
        .close-btn:hover {
            background-color: darkred;
        }
    </style>