.upload-container {
            border: 1px dashed #FF0000;
            width: 80%;
            max-width: 350px;
            margin: 0 auto;
            padding: 10px;
            text-align: center;
        }
        .upload-container.dragover { border: 3px dashed #00FF00; }
        .upload-container input[type="file"] { display: none; }
        .upload-container label {
            display: block;
            cursor: pointer;
            padding: 10px;
            background:#00bcd4;
            color: white;
            border-radius: 5px;
        }