style.css

@import url('https://fonts.googleapis.com/css?family=Hind');

*, *::before, *::after {
	box-sizing: border-box;
}

html, body {
	height: 100%;
	overflow: hidden;
}

body {
	display: flex;
	justify-content: center;
	align-items: center;
	margin: 0;
	color: #dee2e6;
	background-color: #212529;
	font-family: 'Hind', sans-serif;
	text-transform: uppercase;
}

.container {
	position: relative;
	line-height: 0;
}

.score {
	position: absolute;
	top: 10px;
	line-height: 1;
}

.score span {
	font-size: 3.25rem;
}

.current-score {
	left: 10px;
}

.high-score {
	text-align: right;
	right: 10px;
}

.trigger {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
	position: absolute;
	width: 80px;
	height: 80px;
	bottom: 10px;
  border: 0;
	border-radius: 50%;
  color: inherit;
	background-color: #e64980;
	text-align: center;
	line-height: 80px;
	font-size: 1.25rem;
  text-transform: inherit;
	cursor: pointer;
	-webkit-user-select: none;
	   -moz-user-select: none;
	    -ms-user-select: none;
	        user-select: none;
  outline: none;
}

.left-trigger {
	left: 10px;
}

.right-trigger {
	right: 60px;
}

canvas {
	overflow: hidden;
	border-radius: 5px;
	box-shadow: 0 5px 25px rgba(0, 0, 0, 0.75);
}

/* responsive scaling, because pinball tables are tall */
@media (min-height: 0px) {
	.container { transform: scale(0.25); }
}
@media (min-height: 400px) {
	.container { transform: scale(0.5); }
}
@media (min-height: 600px) {
	.container { transform: scale(0.75); }
}
@media (min-height: 800px) {
	.container { transform: scale(1); }
}