.header_main{
	width:100%;
	background-image:url(https://tkblumenkamp.de/img/95_J_TKB_Bild_222_3.jpg);
	background-position:top;
	background-attachment:fixed;
	background-repeat:no-repeat;
	background-size:cover;
	height:75%;
}

.header_main p{
	font-weight:bold;
	margin:auto 0px;
	width:100%;
	text-align:center;
	color:white;
	font-size:50px;
	background-color:rgba(47, 105, 86, 0.5);
}

a.btn_up{
	position:absolute;
	bottom:0;
	left:50%;
	transform:translate(-50%,0);
	transition:0.3s;
	
}

a.btn_up:hover{
	bottom:10px;
}