/* Layout */
		body {
			min-width: 630px;
		}

		#container {
			padding-left: 200px;
			padding-right: 190px;
		}
		
		#container .column {
			position: relative;
			float: left;
		}
		
		#center {
			padding: 10px 20px;
			width: 100%;
		}
		
		#left {
			width: 180px;
			padding: 0 10px;
			right: 240px;
			margin-left: -100%;
		}
		
		#right {
			width: 130px;
			padding: 0 10px;
			margin-right: -100%;
		}
		
		#footer {
			clear: both;
		}
		
		/* IE hack */
		* html #left {
			left: 150px;
		}

		/* Make the columns the same height as each other */
		#container {
			overflow: hidden;
		}

		#container .column {
			padding-bottom: 1001em;
			margin-bottom: -1000em;
		}

		/* Fix for the footer */
		* html body {
			overflow: hidden;
		}
		
		* html #footer-wrapper {
			float: left;
			position: relative;
			width: 100%;
			padding-bottom: 10010px;
			margin-bottom: -10000px;
			background: #fff;
		}

		/* Aesthetics */
		body {
			margin: 0;
			padding: 0;
			font-family:Sans-serif;
			line-height: 1.5em;
		}
		
		p {
			color: #555;
		}

		nav ul {
			list-style-type: none;
			margin: 0;
			padding: 0;
		}
		
		nav ul a {
			color: darkgreen;
			text-decoration: none;
			padding:5px;
			border:1px rgba(107, 61, 7, 0.979) solid;
			border-radius: 10px;
			cursor: pointer;
		}

		
		li {
			margin:8px;
		}

		#header, #footer {
			font-size: large;
			padding: 0.3em;
			background: #BCCE98;
		}

		#left {
			background: #DAE9BC;
		}
		
		#right {
			background: #F7FDEB;
		}

		#center {
			background: #fff;
		}

		#container .column {
			padding-top: 1em;
		}
		
		.operatorButton{
			padding:5px;
			border:3px #574d80 solid;
			margin:2px;
			text-align: center;
			border-radius: 10px;
			cursor: pointer;
		}
		
		.main_body{
			border:3px #574d80 solid;
			padding:15px;
			width:300px;
			height:0px;
			margin:5px;
			display:none;
		}

		.add_transition{
			transition: height 0.5s, width 0.5s, padding 0.5s, visibility 0.5s, opacity 0.5s ease-out;
		}

		.done_button{
			margin-left:5px;
		}

		.math_question{
			font-weight: bold;
			font-size: 50px;
			transition-delay: 0.4s;
			display:none;
		}

		.addition_list{
			display:none;
			margin-left: 5px;
		}

		.subtraction_list{
			display:none;
			margin-left: 5px;
		}
		.question_result{
			font-weight: bold;
			font-size: 50px;
			transition-delay: 0.4s;
			display:block;
		}

		.inbl{
			display:inline-block;
		}

		.clear_button{
			margin-left:20px;
		}