style.css

/*
 * Surds - Style.css
 */

* {
	margin: 0;
	padding: 0;
}

ul li {
	list-style: none;
	display: inline-block;
}

body { 
	position: relative;
  	font-family: 'Open Sans', sans-serif;
}

body > canvas { 
  margin: auto; 
  border: 4px solid #80CBC4; 
  display: flex; 
  flex-direction: column;
  align-items: center; 
  justify-content: center;
}

#gamebar {
	display: flex;
	margin: 1rem 5rem;
	font-family: 'Black Han Sans', sans-serif;
}

#mission {
	margin-right: 1em;
}

#mission li, #collection li {
	padding: 0.1rem 0.5rem;
	color: #FFF;
}

.button {
	text-align: center;
	margin-top: 0.3rem;
}

.start {
	background: #f44336;
	padding: 0.5em 1em; 
	border: 0;
	color: #FFF;
	text-transform: uppercase;
	letter-spacing: 1px;
}

canvas { background: #eee; }

.game-over {
	display: none;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	background: #333;
	color: #FFF;
	padding: 3em;
	text-align: center;
}

.game-over button {
	background: #FFF;
	color: #333;
	padding: 0.5em 2em;
	margin: 0.5em auto;
	text-align: center;
	border: 0;
}

.game-settings {
	background: #FFF;
	padding: 2em;
	text-align: center;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}

.setting-form div {
	margin: 1em 0;
}

input, select {
	background: #eee;
	border: 0;
	margin-top: 1em;
	padding: 0.5em;
	width: 100%;
}

.game-settings-list p {
	border-bottom: 1px solid;
	border-color: #eee;
	padding-bottom: 1em;
}

.instruction {
	text-align: center;
	margin: 0.5rem auto 0 auto;
}

.instruction p {
	font-size: 0.8rem;
}