CSS + Inline Image Technique:  

Html block could be like

<div class=”frame”>
<img src=”http://www.takanen.eu/wp-content/uploads/2017/02/lennart_b_logo.png” class=”img” alt=”” id=”logox” style=”” />
</div>

 

css part is 

html {
width:100%;
height:100%;
background:url(logo.png) center center no-repeat;
}
#logox {

}

img {
position: absolute;
top: 50%;
left: 50%;
width:250px;
margin-top: -0%; /* Half the height */
margin-left: -0%; /* Half the width */

}
.frame {
width: 100%;
height: 100%;

}

 

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