* {
	padding: 0;
	margin: 0;
	box-sizing: border-box;
	user-select: none;
 }
 a:focus {
	outline: 0;
 }
 html {
	background: #313940;
 }
 body {
	min-height: 100vh;
	background-color: #313940;
	font-family: "Open Sans", Arial, Helvetica, sans-serif;
	background: #313940;
	overflow-x: hidden;
 }
 .header {
	text-align: center;
	width: 100%;
	border-bottom: 1px solid;
	border-image-slice: 1;
	border-image-source: linear-gradient(to left, #38495a, #a2abb3, #38495a);
 }
 .header-title {
	line-height: 60px;
	font-weight: 300;
	color: #fff;
 }
 .main {
	min-height: calc(100vh - 110px);
	padding: 60px 10px 0;
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
	align-items: space-between;
	width: 100%;
	max-width: 1140px;
	margin: 0 auto;
 }
 .btn-container {
	display: flex;
	justify-content: space-between;
	width: 306px;
	height: 40px;
	margin: 0 auto;
	margin-bottom: 80px;
 }
 .btn {
	width: 150px;
	height: 40px;
	padding: 0 10px;
	background-color: #454c53;
	border: 0;
	border-radius: 2px;
	font-family: "Open Sans", sans-serif;
	font-size: 16px;
	font-weight: 300;
	color: #fff;
	outline: 0;
	cursor: pointer;
	transition: 0.3s;
 }
 .btn:not(.btn-active):hover {
	background-color: #515961;
 }
 .btn:active {
	background-color: #00c9b7;
 }
 .btn-active {
	background-color: #00b4a4;
 }
 .btn-active:hover {
	background-color: #00c9b7;
 }
 .piano {
	position: relative;
	display: flex;
	justify-content: space-between;
	width: 100%;
	height: 270px;
	max-width: 560px;
	margin: 0 auto 60px;
 }
 .piano-key {
	position: relative;
	width: 80px;
	height: 270px;
	background-color: rgba(255, 255, 255, 0.85);
	margin: 4px;
	border-radius: 0px 0px 12px 12px;
	transition: 0.3s;
	cursor: pointer;
 }
 .piano-key:hover {
	background-color: #fff;
 }
 .keys-sharp {
	position: absolute;
	top: 0;
	bottom: 0;
	left: 53px;
	right: 53px;
	display: flex;
	justify-content: space-between;
	pointer-events: none;
 }
 .piano-key.sharp {
	width: 54px;
	height: 170px;
	background-color: #313940;
	border: 0;
	border-radius: 0px 0px 9px 9px;
	top: 0;
	z-index: 3;
	pointer-events: auto;
	transform-origin: center top;
	margin: 0px;
 }
 .piano-key.piano-key-active,
 .piano-key.sharp.piano-key-active {
	transform: scale(0.96);
 }
 .piano-key.none {
	background-color: transparent;
	border: 0;
	border-radius: 0;
	pointer-events: none;
 }
 .piano-key::before,
 .piano-key::after {
	content: attr(data-note);
	position: absolute;
	width: 40px;
	height: 40px;
	font-size: 26px;
	line-height: 40px;
	text-align: center;
	color: #a2abb3;
	bottom: -45px;
	left: 20px;
	transition: 0.3s;
	pointer-events: none;
 }
 .piano-key::after {
	display: none;
	content: attr(data-letter);
 }
 .piano-key:hover::before,
 .piano-key:hover::after {
	color: #d7dfe6;
 }
 
 .piano-key-active:hover::before,
 .piano-key-active:hover::after {
	color: #00b4a4;
 }
 
 .sharp:active {
	border-top: 0;
 }
 
 .piano-key.sharp::before,
 .piano-key.sharp::after {
	bottom: 175px;
	left: 7px;
 }
 .piano-key.letter::before {
	display: none;
 }
 .piano-key.letter::after {
	display: block;
 }
 .piano-key-letter::before {
	content: attr(data-letter);
 }
 
 .piano-key-remove-mouse:active::before {
	color: #a2abb3;
 }
 
 .piano-key-active-pseudo:hover::after,
 .piano-key-active-pseudo:hover::before,
 .piano-key-active::after,
 .piano-key-active::before {
	color: #00b4a4;
 }
 
 .fullscreen {
	position: fixed;
	top: 120px;
	right: 40px;
	width: 40px;
	height: 40px;
	background-color: rgba(255, 255, 255, 0.3);
	border: 0;
	outline: 0;
	background-size: contain;
	transition: 0.3s;
	cursor: pointer;
	background-image: url("assets/svg/fullscreen-open.svg");
 }
 .fullscreen:hover {
	background-color: rgba(255, 255, 255, 0.5);
 }
 :-webkit-full-screen .fullscreen {
	background-image: url("assets/svg/fullscreen-exit.svg");
 }
 .footer {
	border-top: 1px solid;
	border-image-slice: 1;
	border-image-source: linear-gradient(to left, #38495a, #a2abb3, #38495a);
 }
 .footer-container {
	padding: 0 15px;
	display: flex;
	justify-content: space-between;
	align-items: center;
	width: 100%;
	max-width: 1140px;
	margin: 0 auto;
 }
 .github {
	display: block;
	width: 120px;
	height: 45px;
	padding-left: 45px;
	background-image: url("assets/svg/github.svg");
	background-size: 35px;
	background-repeat: no-repeat;
	background-position: left center;
	line-height: 45px;
	color: #cbd5de;
	font-size: 16px;
	font-family: "Open Sans", sans-serif;
	transition: 0.3s;
 }
 .github:hover {
	color: #fff;
 }
 .rss {
	display: block;
	position: relative;
	font-family: "Open Sans", sans-serif;
	width: 86px;
	height: 32px;
	background-image: url("assets/svg/rss.svg");
	background-size: contain;
	background-repeat: no-repeat;
	background-position: left center;
	padding-right: 111px;
 }
 .rss-year {
	position: absolute;
	bottom: 0;
	right: 0;
	font-size: 21px;
	letter-spacing: -2px;
	color: #cbd5de;
	line-height: 0.9;
	font-weight: bold;
	transition: 0.3s;
 }
 .rss:hover .rss-year {
	right: -5px;
	letter-spacing: 0;
 }
 @media (max-width: 768px) {
	.fullscreen {
	  top: 10px;
	  right: 20px;
	  width: 40px;
	  height: 40px;
	}
 }
 @media (max-width: 600px) {
	.main {
	  padding-top: 40px;
	}
	.piano {
	  width: 310px;
	  height: 160px;
	}
	.piano-key {
	  width: 44px;
	  height: 160px;
	  border-radius: 0px 0px 8px 8px;
	  border: 2px solid #313940;
	}
	.keys-sharp {
	  left: 26px;
	  right: 26px;
	}
	.piano-key.sharp {
	  width: 36px;
	  height: 100px;
	  border-radius: 0px 0px 6px 6px;
	}
	.piano-key::before,
	.piano-key::after {
	  width: 30px;
	  height: 30px;
	  font-size: 22px;
	  bottom: -35px;
	  left: 7px;
	  font-size: 22px;
	}
	.piano-key.sharp::before,
	.piano-key.sharp::after {
	  bottom: 115px;
	  left: 3px;
	}
	.btn-container {
	  width: 244px;
	  height: 40px;
	  margin-bottom: 80px;
	}
	.btn {
	  width: 120px;
	  height: 40px;
	}
 }