.grade, table, th, td {
	border: 1px solid black;
	padding: 10px;
	text-align: center;
}

.responsive {
   width: 100%;
   height: auto;
}

.image_title {
	padding-top: 40px;
}

.keystroke {
	margin: 1px;
	border-style: ridge;
	border-color: 1px solid black;
	border-radius: 7px;
	padding: 5px;
	background-color: #e3e3e3;	
}

.code {
			margin: 5px;
			border: 1px solid black;
			background-color: #ececec;
			padding: 10px;
		}

		.keyword {
			color: #800080;
			font-weight: bold;
		}

		.annotation {
            color:grey;
		}
		
		.string {
			color: #0000ff;
		}

		.comment {
			color: #008080;
		}

		.warning {
            color: red;
            font-weight: bold;
		}
		
		pre {
			margin: 5px;
			border: 1px solid black;
			background-color: #ececec;
			padding: 10px;
		}

		div.homework {
			border: 1px solid black;
			padding: 5px;
			margin: 5px;
		}