html {
	background: gray;
}
body {
    background: lightgray;
    display: flex;
    flex-flow: row wrap;
    max-width: 1280px;
    margin: 0 auto;
    font-family: Verdana;
}
#nav_button {
	display: none;
}
header {
	background: yellowgreen;
	position: relative;
	z-index: 10;
  width: 100%;
}
h1 {
	color: white;
	font-size: 48px;
	text-transform: uppercase;
	text-align: center;
	font-family: Verdana;
	margin: 0;
	padding: 25px;
}
nav {
	width: 25%;
}
nav a {
	display: block;
	background: rgb(255, 0, 191);
	color: white;
	text-decoration: none;
	padding: 5px 10px;
	margin: 5px 0;
}
nav a.active {
	color: rgb(118, 139, 0);
	font-weight: bold;
}
nav a:hover {
	background: white;
	color: rgb(32, 139, 0);
}
main {
	background: white;
	min-height: 400px;
	width: 75%;
	box-sizing: border-box;
	padding: 10px 20px;
}
main img {
    display: block;
    border: 1px solid black;
    width: 50%;
    float: right;
    margin: 0 0 20px 20px;
}
footer {
	background:lightgray;
	color: white;
	text-align: center;
  width: 100%;
  padding: 10px;
}
footer p {
	margin: 0;
	padding: 5px;
	font-weight: bold;
}

@media screen and (max-width:1023px){
	h1{
		font-size: 42px;
	}
	nav{
		width: 100%;
		text-align: center;
		background-color:aqua ;
	}
	nav a{
		display: inline-block;
		margin: 0 5px;
	}
	nav a.active{
		color:aqua;
	}
	nav a:hover{
		color: aqua;
	}
	main{
		width: 100%;
	}
	footer{
		background-color: aqua;
	}
}
@media screen and (max-width:567px){
	h1{
		font-size: 28px;
	}

	nav{
		transition: margin-top 0.5s;
		position: relative;
		margin-top: -150px;
	}	
	nav.open{
		margin-top: 0;
	}
	nav a{
		display: block;
		margin: 2px;
		font-size: 20px;
	}
	main img{
		width: 100%;
		border-radius: 30px 30px 30px 30px;
	}
	#nav_button{
		display: block;
		position: absolute;
		bottom: -12px;
		right: 20px;
		box-sizing: border-box;
		padding: 5px 10px;
		border: 1px solid black;
		background: gray;
		color: yellow;
		font-weight: bold;
		text-align: center;
	}
	#nav_button:hover{
		background: black;
		cursor: pointer;
	}
}