style.css

html {
	height: 100%;
}

body {
	height: 100%;
	background: linear-gradient(#3dc2da, rgb(22, 91, 126));
	background-repeat: no-repeat;
	background-attachment: fixed;
	text-align: center;
	font-family: Arial, Helvetica, sans-serif;
}

h1, h2 {
	font-family: 'Merriweather', Georgia, 'Times New Roman', Times, serif;
}

h1 {
	font-size: 300%;
	letter-spacing: 2px;
	text-shadow: -1px 1px 0 #fff, 1px 1px 0 #fff, 1px -1px 0 #fff, -1px -1px 0 #fff;
	margin-top: 20px;
	margin-bottom: 20px;
}

h2 {
	margin-top: 0px;
	margin-bottom: 50px;
}

main {
	width: 50%;
	min-width: 500px;
	margin: auto;
	border: 2px solid black;
	border-radius: 10px;
	box-shadow: -8px 8px #202020;
	background-color: #ddf;
	padding: 10px;
	text-align: left;
	line-height: 2em;
}

.step {
	margin: 5px 0px;
	padding: 10px;
}

.item {
	font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
	font-size: 110%;
}

label {
	cursor: pointer;
}

/*
* I want the radio button to be darker.
* First, we hide it.
*/
input[type="radio"] {
	position: absolute;
	opacity: 0;
	cursor: pointer;
	height: 0;
	width: 0;
}

/* Then, we create a mock button over it. */
.mock-radio {
	display: inline-block;
	position: relative;
	height: 0.8em;
	width: 0.8em;
	background: linear-gradient(to top, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.4));
	box-sizing: border-box;
	border: 1px solid #888;
	border-radius: 0.4em;
}

/*
* To set up the behaviour when hovering, we wanna use the whole span
* (containing both the button and the text).
*/
label:hover input + .mock-radio {
	background: linear-gradient(to top, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.3));
}

/*
* When checked, turn it green and put a dot in the middle.
*/
label input:checked + .mock-radio {
	background: radial-gradient(white 30%, rgba(0, 0, 0, 0) 30%),
				linear-gradient(to top, #81b62b, #5f9701);
}

#output-container {
	display: inline-block;
	position: relative;
	line-height: 2em;
	min-width: 16em;
	max-width: 100%;
	background-color: white;
	border: 1px solid #aaa;
	border-radius: 5px;
	box-shadow: inset 0 0 2px lightgrey;
	overflow: hidden;
}

#output {
	float: left;
	max-width: 100%;
	overflow-wrap: break-word;
	margin-right: 5px;
}

#copy-button {
	position: relative;
	float: right;
	right: -5ch;
	transition: right 0.5s;
	padding: 0px 5px;
	height: 2em;
	border: 1px solid #aaa;
	border-radius: 5px;
	background: linear-gradient(#eef, #ddf);
	cursor: pointer;
}

#copy-button:hover {
	right: 0;
}

#copy-button:active {
	background: linear-gradient(#ddf, #eef);
}

footer {
	position: fixed;
	bottom: 0px;
	width: 100%;
	text-align: left;
	color: white;
}

#info-icon { font-size: x-large; }

#information {
	/* display: none; */
	position: relative;
	top: 2em;
	transition: top 0.3s ease 0s;
	margin-left: 10px;
}

#info-icon:hover ~ #information {
	/* display: inline-block; */
	top: -0.4em;
}