#center-div {
            position: fixed;
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            padding: 20px;
            display: none;
            z-index: 2000;
            min-width: 300px;
            min-height: 160px;
            border: 2px solid #4b6cb7;
            text-align: center;
        }
#center-div h3 {
            color: #2c3e50;
            margin-top: 5px;
            margin-bottom: 15px;
        }
#center-div p {
            color: #7f8c8d;
            line-height: 1.5;
				  margin-bottom: 15px;
        }
.close-btn {
            position: absolute;
            top: 10px;
            right: 15px;
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: #7f8c8d;
            transition: color 0.3s;
        }
.close-btn:hover {
            color: #e74c3c;
        }
.dim-background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            display: none;
        }