Oops!
You have typed and tested faster!
Anyway, I leave the following for reference only.
=====
Although it can be done in the css.
Your modified file seems not according to the safety guide.
Normally, for the use of override, you may copy the original file from
includes/templates/template_default/common/tpl_header.php
and save it to the override directory of your template
includes/templates/YOUR_TEMPLATE/common/tpl_header.php
For your case now and you had modified the tpl_header.php,
only need to copy your modified file of tpl_header.php and save it to the location as we have discussed.
includes/templates/CUSTOM/common/tpl_header.php
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