.calendar {
            width: 430px;
            background: lightyellow;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            text-align: center;
            margin-bottom: 20px;
        }
        .header_kol {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 18px;
            font-weight: bold;
        }
        .days {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            margin-top: 10px;
            font-weight: bold;
        }
        .dates {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 5px;
            margin-top: 10px;
        }
        .date {
            padding: 10px;
            border-radius: 5px;
            text-align: center;
            transition: 0.3s;
        }
        .date:hover {
            background: #ddd;
            cursor: pointer;
        }
        .today {
            background: #007bff;
            color: white;
            font-weight: bold;
        }
        button {
            padding: 5px 10px;
            border: none;
            background: #007bff;
            color: white;
            border-radius: 5px;
            cursor: pointer;
        }
        button:hover {
            background: #0056b3;
        }