body {
            font-family: Arial, sans-serif;
            background-color: #f0f2f5;
			
			margin: 0;
			padding: 0;
        }
        #header {
            background-color: #1877f2;
            color: #fff;
            padding: 10px;
        }
        #centre {
            max-width: 800px;
            margin: 0 auto;
            background-color: #fff;
            border-radius: 5px;
            padding: 20px;
			
			margin-left: 0;
			transition: margin-left 0.3s;
        }