First off let me just say, I am green when it comes to Magento (all versions) and have been trying to figure this out for two days and I am not sure what else to try. I have been fiddling with a custom template that inherits the Luma theme and I have figured out how to muddle through the xml files for block placements and so forth, mostly getting things to work by trial and error. I changed the default_head_blocks.xml located in my custom theme here:
/app/design/frontend/myvendor/mytheme/Magento_Theme/layout/default_head_blocks.xml
to include a custom css file to override some of the Luma css (mine is labelled as css/mycss.css):
<head>
<meta name="x_ua_compatible" content="IE=edge,chrome=1"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<css src="mage/calendar.css"/>
<css src="css/mycss.css"/><!-- <<<--- I added this -->
<script src="requirejs/require.js"/>
</head>
I was very happy with myself that something I did actually worked, until I went to look at the single product view (the category view inherits the css just fine and I also have the category set to apply my template to in-category products...something else I tried, not sure if that is right or not). I checked to make sure the product itself was also using my template under the Design tab in the admin area, which it says it is. Then I went to the catalog folder to try and mess around with all of the xml documents pertaining to product such as the catalog_product_view.xml, catalog_product_view_type_simple.xml, etc... and adding:
<head>
<css src="css/mycss.css"/>
</head>
I should mention I did move all combinations of these xml files into both:
/app/design/frontend/myvendor/mytheme/Magento_Catalog/layout/
and/or
/app/design/frontend/myvendor/mytheme/Magento_Theme/layout/
Last thing to mention, I flush my cache every time I change something.
Anyway, I have Googled the crap out of this and I tried to adapt some Magento 1.x answers to try and solve it, but I can not figure it out with my limited Magento knowledge. Any push in the right direction would be helpful at this point because I am just staring at my Magento project folder right now with a dumb perplexed look on my face...
EDIT
After more "trial and error" I have deduced that this page, including the account signup, login, etc. are just using the base template...how do I know? I did the unthinkable! Just to test, I added my <css src="css/mycss.css"/> to the base theme's default_head_blocks.xml file located here:
/vendors/magento/theme-frontend-blank/Magento_Theme/layout/default_head_blocks.xml
So I guess my question is, how come it's using the base template (which I already suspected it was doing) and not the one I am assigning it? I am missing something, but I don't know what it is or where to fix it.
