.outer_box
			{
				width:800px;
				height:400px;
				box-shadow:3px 3px 3px black;
				margin:auto;
			}
			
			.sub_box
			{
				width:358px;
				height:358px;
				border:1px solid black;
				float:left;
				background:#DDDDDD;
				padding:20px;
			}
			input[type="button"]
			{
				padding:5px 20px;
				font-size:20px;
			}
			#a_ind,#b_ind
			{
				width:30px;
				height:30px;
				border-radius:50%;
				box-shadow:4px 4px 4px white;
			}
			#a_ind
			{
				background:green;
			}
			#b_ind
			{
				background:red;
			}
			#result
			{
				text-align:center;
				margin-top:20px;
			}