body {
	color: #000;
	font-family: sans-serif;
}

* {
	box-sizing: border-box;
}

a {
	text-decoration: none;
	color: inherit;
}

ul {
	list-style: none;
	margin: 0;
	padding: 0;
}

/*-------- menu block -----------*/
.menu-block {
	display: flex;
	justify-content: center;
	align-items: center;
	overflow: hidden;
	border-top-right-radius: 50px;
	border-bottom-right-radius: 50px;
}

.menu-nav {
	background-color: #fff;
	height: 50px;
	line-height: 50px;
	padding-left: 20px;
	padding-right: 40px;
	margin-right: -25px;
	border-top-left-radius: 50px;
	border-bottom-left-radius: 50px;
	/*--| animation |--*/
	transition: 0.5s;
	transform-origin: right center;
	transform: translateX(100%);
	opacity: 0;
}

.menu-nav_active {
	transform: translateX(0);
	opacity: 1;
}

.menu-nav__link {
	display: inline-block;
	color: #222;
	margin-right: 20px;
}

/*-------- button -----------*/
.section {
	height: 100vh;
	background-color: #7b1fa2;
	display: flex;
	justify-content: center;
	align-items: center;
}

.menu-btn {
	display: block;
	width: 50px;
	height: 50px;
	background-color: #fff;
	border-radius: 50%;
	position: relative;
}

.menu-btn span, 
.menu-btn span:before,
.menu-btn span:after { 
	position: absolute;
	top: 50%; margin-top: -1px;
	left: 50%; margin-left: -10px;
	width: 20px;
	height: 2px;
	background-color: #222;
}

.menu-btn span:before,
.menu-btn span:after {
	content: '';
	display: block;
	transition: 0.2s;
}

.menu-btn span:before {
	transform: translateY(-5px);
}

.menu-btn span:after {
	transform: translateY(5px);
}

.menu-btn_active span {
	height: 0;
}

.menu-btn_active span:before {
	transform: rotate(45deg);
}

.menu-btn_active span:after {
	transform: rotate(-45deg);
}