Website/calc/style.css

body {
	background: #111;
	color: #fff;
	font-family: "Open Sans";
}

button {
	background: #222;
	border: 1px solid #000;
	padding: 7px;
	color: white;
	transition: 0.1s;
	margin: 2px;
	border-radius: 3px;
}

button:hover {
	background: #333;
	cursor: pointer;
}

select {
	display: inline-block;
	position: relative;
	overflow: hidden;
	padding: 5px;
	background: #222;
	border: 1px solid #000;
	border-radius: 3px;
	color: white;
	cursor: pointer;
	-webkit-appearance: none;
}

select::before {
	border-bottom-style: solid;
	border-top: none;
}

select:after {
	margin-top: 7px;
	border-top-style: solid;
	border-bottom: none;
}