style.css

body {
	font-family: arial;
	background-color:black;
	background-repeat: no-repeat;
}

#content {
	width: 800px;
	margin: auto;
	background-color: rgba(255, 255, 255, 0.85);
	padding-left: 50px;
	padding-right: 50px;
	padding-top: 1px;
	padding-bottom: 50px;
	margin-top: 100px;
	border-radius: 20px;
	color: black;
}

h1 {
	font-size: 50px;
}
#message {
	text-align: center;
	width: 100%;
}

.clearfix:after { 
   content: " ";
   display: block; 
   height: 0; 
   clear: both;
}

#left-column {
	float: left;
	width: 400px;
}

#right-column {
	float: left;
	width: 400px;
}

#download_link {
	width: 100px;
	border: white outset 3px;
	display: block;
	text-decoration: none;
	color: black;
	background-color: white;
	border-radius: 10px;
	font-weight: bold;
	font-size: 20px;
	padding: 3px;
	margin: auto;
}

#download_link:active {
	border: white inset 3px;
}

#avatar {
	border-radius: 20000px;
}

#img_canvas {
	border: solid white 3px;
}

#show-advanced:not(:checked) ~ #advanced-settings {
	visibility: hidden;
	position:absolute;
}

.fixed-width-label {
	display: inline-block;
	width: 100px;
}

input#form-apikey {
	width: 270px;
}

#form-width, #form-height {
	width: 81px;
}

.footer {
	width:100%;
	float:left;
	text-align: center;
}