Manuscritp theme header

Hi there,

I would like to change the background color of the header to be replaced by my background logo image.
Could I know the size of the header ? and I wat to put the register and login link below so the the background image will take everything. I use the code below in my custom css file but not changes

.pkp_structure_head_wrapper {
background-image: url(‘http://mysite/ameclogo2.jpg’);
background-repeat: no-repeat;

Did you check .less/styling files for that theme?

Yes I did theck the less file for the header an created my custom css code since i have read in the form not use modify the orginal file. but it does not make an effect

Do you have any suggestions?