body {
background:url("images/logocoif.png") no-repeat  center center fixed; 
}

* {
	margin:0;
	padding:0;
	list-style:none;
	box-sizing:border-box;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.tatse {
  margin: 330px auto 10px;
}


/*
#################### CSS for the Headline or Navbar #################### 
*/
header {
	width:100%;
	float:left;
	border-bottom:1px solid rgba(0,0,0,0.5);
color: White;
background: #3d3d3d;
}

header img {
  vertical-align: middle;
  padding: 0 0px 0 0px;
  margin: 0 3px 3px 25px;
}

.logo {
	display:block;
	width:100%;
	padding:0.5em;
	text-decoration:none;
	color:white;
}

nav {
	width:100%;
	float:left;
}

nav li {
	float:left;
	width:100%;
}

nav a {
	display:block;
	height:100%;
	width:100%;
	padding:1em;
	text-decoration:none;
	color:white;
	border-top:1px solid rgba(0,0,0,0.5);
}

nav a:hover {
	background:rgba(0,0,0,0.2);
}

@media screen and (min-width:800px) {
	
	.logo {
		width:auto;
		float:right;	
	}
	
	nav {
		float:left;
		width:auto;
	}

	nav a {
		border:none;
	}
	
	nav li {
		width:auto;
	}

}


/*
#################### end of CSS for the Headline or Navbar #################### 

############## CSS for main Element ############## 
*/
.mitte {
  display: block;
  margin: 30px auto 10px;
}

button {
  font: normal 1.2em Arial, sans-serif;
  background-color: #4CAF50; /* Green */
  color: white;
  padding: 5px;
}

button:hover {
  background-color: #3d3d3d;
  color: red;
}