html {
    background-image: url(tulpan-orange-lion.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}
body {
    max-width: 1280px;
    margin: 0 auto;
    font-family: "Arial";
    display: flex;
    flex-flow: row wrap;
    letter-spacing: 0.5px;
}
#nav_button {
	display: none;
}




/*HEADER*/
header {
    border: 3px solid #880000;
	background: #21C9FF;
	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*/
nav {
    text-align: center;
	width: 25%;
}
nav a {
	display: block;
	background: #00B5EF;
	color: white;
	text-decoration: none;
	padding: 20px 20px;
	margin-bottom: 10px;
    font-size: 20px;
    box-shadow: 3px 3px 3px 3px #880000;
}
nav a.active {
	color: black;
	font-weight: bold;
}
nav a:hover {
	background: white;
	color: black;
}




/*MAIN*/
main {
	background: white;
	min-height: 400px;
	width: 75%;
	box-sizing: border-box;
	padding: 10px 20px;
    border-right: 3px solid #880000;
    border-bottom: 3px solid #880000;
}
main img {
    display: block;
    border: 1px solid black;
    width: 50%;
    float: right;
    margin: 0 0 20px 20px;
}




/*FOOTER*/
footer {
    text-align: center;
    background-color: #0091DA;
    width: 100%;
    margin: 0 auto;
    margin-top: 15px;
    position: relative;
    bottom: 0;
    height: 200px;
    box-shadow: 1px 1px 4px 2px #880000;
    padding-top: 30px;
}
footer p {
	margin: 0;
	padding: 5px;
}






@media screen and (max-width:1023px) {
    h1{
        font-size: 42px;
    }
    nav{
        width: 100%;
        text-align: center;
    }
    nav a{
        display: inline-block;
        margin: 0 5px;
    }
    main{
        width: 100%;
    }
}

@media screen and (max-width:567px){
    h1{
        font-size: 28px;
    }
    nav{
        transition: margin-top 0.5s;
        position: relative;
        margin-top: -210px;
    }
    nav.open{
        margin-top: 0;
    }
    nav a{
        display: block;
        margin-bottom: 5px;
        font-size: 20px;
    }
    main img{
        width: 100%;
    }
    #nav_button{
        display: block;
        position: absolute;
        bottom: 20 px;
        right: 20px;
        box-sizing: border-box;
        padding: 5px 10px;
        border: 2px solid black;
        background: #1DB4FF;
        color: #1DFF8B;
        font-weight: bold;
        text-align: center;
    }
    #nav_button:hover{
        background: black;
        cursor: pointer;
    }
}