Removing header logo and color etc

A link to your site would help.

Here it is: https://www.sorgedrager.nl//wordpress/

First of all, go to Admin/Settings/General and check your WordPress address and Blog address. Neither should contain two ‘//’. They should probably be set to https://www.sorgedrager.nl/wordpress/.

To hide the header, edit #header {style.css (line 244):

background-color:#73A0C5;
height:200px;
margin:0 0 0 1px;
padding:0;
width:758px;
}

and add:

display:none;

Thanks