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

body  {
	background: #1abc9c;
}

.container {
	padding: 80px;
}

.bt-menu {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 0;
	border-width: 0px;
	border-style: solid;
	border-color: #333;
	background-color: rgba(0,0,0,0);
	-webkit-backface-visibility: hidden;
	-webkit-transition: border-width 0.3s, background-color 0.3s, height 0s 0.3s;
	transition: border-width 0.3s, background-color 0.3s, height 0s 0.3s;
}

.bt-menu.bt-menu-open {
	height: 100%;
	border-width: 0px 0px 50px 150px;
	background-color: rgba(0,0,0,0.3);
	-webkit-transition: border-width 0.3s, background-color 0.3s;
	transition: border-width 0.3s, background-color 0.3s;
}

.bt-overlay {
	position: absolute;
	width: 100%;
}

.bt-menu-open .bt-overlay {
	height: 100%;
}

.bt-menu-trigger {
	position: fixed;
	top: 10px;
	left: 20px;
	z-index: 100;
	display: block;
	width: 50px;
	height: 50px;
	cursor: pointer;
}

.bt-menu-trigger span {
	position: absolute;
	top: 50%;
	left: 0;
	display: block;
	width: 100%;
	height: 8%;
	background-color: #fff;
	font-size: 0px;
	-webkit-touch-callout: none;
	-webkit-user-select: none;
	-khtml-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	-webkit-transition: background-color 0.3s;
	transition: background-color 0.3s;
}

.bt-menu-trigger span:before,
.bt-menu-trigger span:after {
	position: absolute;
	left: 0;
	width: 100%;
	height: 100%;
	background: #fff;
	content: '';
	-webkit-transition: -webkit-transform 0.3s;
	transition: transform 0.3s;
}

.bt-menu-trigger span:before {
	-webkit-transform: translateY(-250%);
	transform: translateY(-250%);
}

.bt-menu-trigger span:after {
	-webkit-transform: translateY(250%);
	transform: translateY(250%);
}

.bt-menu-open .bt-menu-trigger span:before {
	-webkit-transform: translateY(-300%);
	transform: translateY(-300%);
}

.bt-menu-open .bt-menu-trigger span:after {
	-webkit-transform: translateY(300%);
	transform: translateY(300%);
}

.bt-menu ul {
	position: fixed;
	margin: 0;
	padding: 0;
	list-style: none;
}

.bt-menu ul:first-of-type {
	top: 75px;
	left: 0;
}

.bt-menu ul:nth-of-type(2) {
	right: 0;
	bottom: 0;
}

.bt-menu ul li,
.bt-menu ul li a {
	display: block;
}

.bt-menu ul:nth-of-type(2) li {
	float: left;
	font-size: 0px;
}

.bt-menu ul li {
	visibility: hidden;
	opacity: 0;
	-webkit-transition: -webkit-transform 0.3s, opacity 0.2s, visibility 0s 0.3s;
	transition: transform 0.3s, opacity 0.2s, visibility 0s 0.3s;
}

.bt-menu.bt-menu-open ul:first-of-type li,
.bt-menu.bt-menu-open ul:nth-of-type(2) li {
	visibility: visible;
	opacity: 1;
	-webkit-transition: -webkit-transform 0.3s, opacity 0.3s 0.1s;
	transition: transform 0.3s, opacity 0.3s;
}

/* First menu */
.bt-menu ul:first-of-type li {
	width: 150px;
	height: 50px;
	line-height: 50px;
	-webkit-transform: translate3d(-100%,50%,0);
	transform: translate3d(-100%,50%,0);
}

.bt-menu.bt-menu-open ul:first-of-type li {
	-webkit-transform: translate3d(0,0,0);
	transform: translate3d(0,0,0);
}

/* Second menu */
.bt-menu ul:nth-of-type(2) li {
	width: 60px;
	height: 50px;
	line-height: 50px;
	-webkit-transform: scale(0);
	transform: scale(0);
}

.bt-menu.bt-menu-open ul:nth-of-type(2) li:first-child { 
	-webkit-transition-delay: 0.1s;
	transition-delay: 0.1s;
}

.bt-menu.bt-menu-open ul:nth-of-type(2) li:nth-child(2) { 
	-webkit-transition-delay: 0.2s;
	transition-delay: 0.2s;
}

.bt-menu.bt-menu-open ul:nth-of-type(2) li:nth-child(3) { 
	-webkit-transition-delay: 0.3s;
	transition-delay: 0.3s;
}

.bt-menu.bt-menu-open ul:nth-of-type(2) li:nth-child(4) {
	-webkit-transition-delay: 0.4s;
	transition-delay: 0.4s;
}

.bt-menu.bt-menu-open ul:nth-of-type(2) li {
	-webkit-transform: scale(1);
	transform: scale(1);
}

.bt-menu ul li a {
	display: block;
	outline: none;
	text-decoration: none;
}

.bt-menu ul:first-of-type li a {
	padding: 0 20px;
	box-shadow: inset 0 1px rgba(0,0,0,0.2);
	color: #fff;
	text-transform: uppercase;
	letter-spacing: 1px;
	font-size: 1em;
	-webkit-transition: color 0.2s;
	transition: color 0.2s;
}

.bt-menu ul:first-of-type li:last-child a {
	box-shadow: inset 0 1px rgba(0,0,0,0.2), inset 0 -1px rgba(0,0,0,0.2);
}

.bt-menu ul:nth-of-type(2) li a {
	color: transparent;
	text-align: center;
	font-size: 0px;
}

.bt-menu ul li a:before {
	color: #fff;
	font-size: 24px;
	-webkit-transition: color 0.2s;
	transition: color 0.2s;
}

.bt-menu ul:first-of-type li a:hover,
.bt-menu ul:first-of-type li a:focus,
.bt-menu ul li a:hover:before,
.bt-menu ul li a:focus:before {
	color: #1abc9c;
}