.progress-bar {
            width: 100%;
            height: 5px;
            background-color: #f3f3f3;
            position: relative;
            overflow: hidden;
            display: none;
        }

        .progress {
            z-index: 99;
            width: 0;
            height: 100%;
            background-color: #4caf50;
            position: absolute;
            animation: progress-animation 1s linear infinite;
        }

        @keyframes progress-animation {
            0% { width: 0%; }
            100% { width: 100%; }
        }