Menú lateral con Html y Css

by Slee

HTML

<!DOCTYPE html>
<html lang="es">
<head>
	<meta charset="UTF-8">
	<title>Menù Lateral con Css</title>
	<link rel="stylesheet" href="estilos.css">
</head>
<body>
	<header class="header">
		<div class="container">
		<div class="btn-menu">
			<label for="btn-menu">☰</label>
		</div>
			<div class="logo">
				<h1>Logotipo</h1>
			</div>
			<nav class="menu">
				<a href="#">Inicio</a>
				<a href="#">Nosotros</a>
				<a href="#">Blog</a>
				<a href="#">Contacto</a>
			</nav>
		</div>
	</header>
	<div class="capa"></div>
<!--	--------------->
<input type="checkbox" id="btn-menu">
<div class="container-menu">
	<div class="cont-menu">
		<nav>
			<a href="#">Portafolio</a>
			<a href="#">Servicios</a>
			<a href="#">Suscribirse</a>
			<a href="#">Facebook</a>
			<a href="#">Youtube</a>
			<a href="#">Instagram</a>
		</nav>
		<label for="btn-menu">✖️</label>
	</div>
</div>
</body>
</html>

CSS

@import url("https://fonts.googleapis.com/css?family=Montserrat|Montserrat+Alternates|Poppins&display=swap");
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Montserrat Alternates", sans-serif;
}
body {
  background-image: url("https://cdn.pixabay.com/photo/2023/05/28/09/21/south-tyrol-8023213_1280.jpg");
  background-attachment: fixed;
  background-size: cover; 
  background-position: center; 
  background-repeat: no-repeat;
}
.capa {
  position: fixed;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  z-index: -1;
  top: 0;
  left: 0;
}
/*Estilos para el encabezado*/
.header {
  width: 100%;
  height: 100px;
  position: fixed;
  top: 0;
  left: 0;
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}
.container .btn-menu,
.logo {
  float: left;
  line-height: 100px;
}
.container .btn-menu label {
  color: #fff;
  font-size: 25px;
  cursor: pointer;
}
.logo h1 {
  color: #fff;
  font-weight: 400;
  font-size: 22px;
  margin-left: 10px;
}
.container .menu {
  float: right;
  line-height: 100px;
}
.container .menu a {
  display: inline-block;
  padding: 15px;
  line-height: normal;
  text-decoration: none;
  color: #fff;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
  font-size: 15px;
  margin-right: 5px;
}
.container .menu a:hover {
  border-bottom: 2px solid #c7c7c7;
  padding-bottom: 5px;
}
/*Fin de Estilos para el encabezado*/

/*Menù lateral*/
#btn-menu {
  display: none;
}
.container-menu {
  position: absolute;
  background: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100vh;
  top: 0;
  left: 0;
  transition: all 500ms ease;
  opacity: 0;
  visibility: hidden;
}
#btn-menu:checked ~ .container-menu {
  opacity: 1;
  visibility: visible;
}
.cont-menu {
  width: 100%;
  max-width: 250px;
  background: #1c1c1c;
  height: 100vh;
  position: relative;
  transition: all 500ms ease;
  transform: translateX(-100%);
}
#btn-menu:checked ~ .container-menu .cont-menu {
  transform:...