timer.css

* {
	box-sizing: border-box;
	font-weight: 100;
}

html, body {
	font-family: "Helvetica", "Arial", "sans-serif";
	font-size: 100%;
	font-size: 150%;
	font-weight: 100;
	overflow: hidden;
}

button {
	font-family: "Helvetica", "Arial", "sans-serif";
	background: whitesmoke;
	border: 1px solid gainsboro;
	border-radius: 3px;
	box-shadow: inset 0 0 1px gainsboro;
}

button:hover {
	box-shadow: inset 0 0 3px gainsboro, 0 0 2px orange;
}

button:active {
	box-shadow: inset 0 0 8px gray;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

.container {
	width: 75%;
	margin: auto;
}

#timer-setup {
	text-align: center;
	position: relative;
	left: 0;

	-moz-transition: left 0.5s;
	-webkit-transition: left 0.5s;
	-o-transition: left 0.5s;
	transition: left 0.5s;
}

#timer-setup > input {
	font-family: "Helvetica", "Arial", "sans-serif";
	width: 80px;
	margin: 10px;
	padding: 5px;
	font-size: 100%;
	border: 1px solid gainsboro;
	border-radius: 3px;
	box-shadow: inset 0 0 1px 1px gainsboro;
}

#timer-setup > input[type="radio"] {
	width: 16px;
	vertical-align: middle;
}

#timer-setup > label {
	display: inline-block;
}

#timer-setup > button {
	margin-left: 50px;
	font-size: 100%;
	padding: 5px 15px;
	margin-top: 20px;
}

#countdown {
	box-shadow: 0 0 5px gray;
	position: fixed;
	top: 33%;
	left: -10000;
	height: 180px;
	width: 100%;
	background-color: none;

	-moz-transition: background-color 1s, left 0.5s;
	-webkit-transition: background-color 1s, left 0.5s;
	-o-transition: background-color 1s, left 0.5s;
	transition: background-color 1s, left 0.5s;
}

#countdown > .display {
	margin: 10px 0 0 0;
	font-size: 3.8em;
	text-align: center;
}

#countdown > .cancel {
	position: absolute;
	top: 10px;
	right: 10px;
	width: 40px;
	height: 40px;
}