* {
    font-family: Arial;
}

body {
    margin: 0px;
    padding: 0px;
}

div#content {
    max-width: 1200px;
    margin-left: 20px;
    margin-right: 20px;
}

*:focus {
	outline: none;
}

@media screen and (min-width: 1240px) {
    div#content {
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
    }
}

div#title {
	text-align: center;
	font-size: 45px;
	font-weight: bold;
	padding: 15px;
}

div#input textarea {
	width: 100%;
	height: 500px;
	resize: none;
	padding: 15px;
	border: 3px solid #000;
	border-radius: 5px;
	margin-bottom: 15px;
}

div#input div#dooperation {
	padding: 15px;
	font-weight: bold;
	font-size: 25px;
	background-color: #c0392b;
	color: #FFF;
	cursor: pointer;
	text-align: center;
	border-radius: 5px;
	margin-bottom: 15px;
}

div#output {
	border: 3px solid #000;
	border-radius: 5px;
}

div#outputlabel {
	margin: 15px;
	text-align: center;
	font-size: 25px;
	font-weight: bold;
}

pre#textzone {
	padding: 15px;
	color: #fff;
	background-color: #000;
	overflow-x: scroll;
	font-family: Courier;
}