.bt-menu-trigger {
	position: fixed;
	top: 15px;
	left: 20px;
	display: block;
	width: 50px;
	height: 50px;
	cursor: pointer;
}

.bt-menu-trigger span {
	position: absolute;
	top: 50%;
	left: 0;
	display: block;
	width: 100%;
	height: 4px;
	margin-top: -2px;
	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;
}

.st-menu-open .bt-menu-trigger span {
	background-color: transparent;
}

.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%);
}

.st-menu-open .bt-menu-trigger span:before {
	-webkit-transform: translateY(0) rotate(45deg);
	transform: translateY(0) rotate(45deg);
}

.st-menu-open .bt-menu-trigger span:after {
	-webkit-transform: translateY(0) rotate(-45deg);
	transform: translateY(0) rotate(-45deg);
}