@charset "utf-8";

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre,a, abbr, acronym, address, big, cite, code,del, dfn,  img, ins, kbd, q, s, samp,
small, strike,  sub, sup, tt, var,u, i, center,dl, dt, dd, ol, ul, li,fieldset, form, label, legend,table, caption, tbody, tfoot, thead, tr, th, td,article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary,time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

html, body {
	width: 100%;
	height: 100%;
	min-height: 100%;	
	font-family: 'Marcellus SC', serif;
	font-size:14px;
	background: #303184 url("../img/bg.jpg") no-repeat center center;
	background-size: cover;
	line-height: 150%;
	-webkit-text-size-adjust: none;
}


html, body, a {	color: #303184;}



#container, #border1, #border2{
	position: absolute;
	top: 0px;
	left: 0px;
	right: 0px;
	bottom: 0px;
}

	.centered{
		position: relative;
		width: 100%;
		margin: 0 auto 0 auto;
		transition:all .2s linear; 
		-o-transition:all .2s linear; 
		-moz-transition:all .2s linear; 
		-webkit-transition:all .2s linear;
	}

#container:before{
	position: absolute;
	top: 25px;
	left: 25px;
	width: 50px;
	height: 50px;
	background: url("../img/svg-hageco-symbol.svg") no-repeat top left;
	
}


#border1:before, #border1:after, #border2:before, #border2:after{
	position: absolute;
	background:#fff;
	opacity: 0.3;
}

#border1:before{ top: 100px; left: 25px; bottom: 25px; width: 1px; }
#border1:after{ bottom: 25px; left: 25px; right: 25px; height: 1px; }

#border2:before{ top: 25px; right: 25px; bottom: 25px; width: 1px; }
#border2:after{ top: 25px; left: 100px; right: 25px; height: 1px; }

.container{
	position: relative;
	float: left;
	width: 100%;
}

::before, ::after{ content:''; } 

.trans, ::before, ::after{
    transition:all .2s linear; 
    -o-transition:all .2s linear; 
    -moz-transition:all .2s linear; 
    -webkit-transition:all .2s linear;
}

#blok{
	position: fixed;
	bottom: 70px;
	right: 70px;
	width: 600px;
	background: #fff;
	box-shadow: 0px 5px 10px rgba(0,0,0,0.5);
	box-sizing: border-box;
	border-radius: 15px;
	padding: 40px 0 40px 310px;
	font-weight: bold;
}

#blok:before {
	position: absolute;
	top: 30px;
	left: 30px;
	width: 200px;
	height: 200px;
	background: url("../img/svg-hageco.svg") no-repeat center center;
	background-size: 70%;
}

#blok:after {
	position: absolute;
	top: 50px;
	left: 250px;
	width: 3px;
	bottom: 50px;
	background: #D4D8E9;
}

.rij { padding: 8px 0 8px 40px;  margin-top: 5px; text-decoration: none; }
a.rij:hover {  text-decoration: underline; }
.rij:before { position: absolute; top: 10px; left: 0px; width: 40px; bottom: 0px; }

.rij.adres:before { background: url("../img/svg-adres.svg") no-repeat left 5px; background-size: auto 15px;}
.rij.telefoon:before { background: url("../img/svg-telefoon.svg") no-repeat left 0px; background-size: auto 16px;}
.rij.mobiel:before { background: url("../img/svg-mobiel.svg") no-repeat 3px 0px; background-size: auto 20px;}
.rij.email:before { background: url("../img/svg-email.svg") no-repeat 2px 0px; background-size: auto 13px;}


.rij.adres span { font-size: 12px; font-style: italic; opacity: 0.5; }

@media screen and (min-width: 1px) and (max-width: 760px) and (min-height: 561px)  {
	
	body{  min-height: 500px; }
	
	.centered{ width: 300px; }
	
	#blok{
		right: 50%;
		bottom: 50px;
		margin-right: -150px;
		width: 300px;
		margin-top: 90px;
		padding: 230px 40px 40px 40px;
	}

	#blok:before {
		position: absolute;
		top: 30px;
		left: 30px;
		width: 240px;
		height: 200px;
		background: url("../img/svg-hageco.svg") no-repeat center center;
		background-size: 70%;
	}

	
	#blok:after { display: none; }	

}

@media screen and (min-width: 1px) and (max-width: 760px) and (min-height: 1px) and (max-height: 560px){
	
	body{  }
	
	.centered{ width: 300px; }
	
	#container:before, #border1, #border2 { display: none; }

	#blok{
		bottom: 50%;
		right: 50%;
		width: 480px;
		margin: 0 -240px -120px 0;
		padding: 30px 0 30px 230px;
	}
	
	#blok:before { left: 10px;  }
	#blok:after { display: none; }	

}



Try adding

orientation : landscape

@media only screen and (min-device-width: 480px) 
                   and (max-device-width: 640px) 
                   and (orientation: landscape) {

	
	body{  }
	
	.centered{ width: 300px; }
	
	#container:before, #border1, #border2 { display: none; }

	#blok{
		bottom: 50%;
		right: 50%;
		width: 480px;
		margin: 0 -240px -120px 0;
		padding: 30px 0 30px 230px;
	}
	
	#blok:before { left: 10px;  }
	#blok:after { display: none; }	
}