How to make a page of thumbnail images for category page

this is the url where I got that code:
https://matthiaspabst.de/wordpress-thumbnailseite-mit-artikelbildern/

your code was not usable because it was posted without being marked properly as code.

please post the code again – https://codex.www.ads-software.com/Forum_Welcome#Posting_Code

https://pastebin.com/Mn7VM2La

rather than getting a grid of thumbnails, I am now getting a list of text with no picture at all

the code seems to be ok; checked in a test setup with a child theme of Twenty Twelve.

are you using the css from the article? (you might need to adapt that to suit your theme).

do all your posts have the ‘featured image’ aka post thumbnail?

https://codex.www.ads-software.com/Post_Thumbnails

can your result be viewed live ?

I had not set a featured image – that seems to have fixed it – but the thumbnail is huge – where do I change the thumbnail size setting? Thank you!

URL: https://www.daily-mash.com/wordpress2/category/photos/

They aren’t actually showing up as thumbnails – it is displaying the image full-sized…

I guess there is some css along with it that looks like it defines the thumbnail size – I don’t know how to incorporate this css with this template though – do I make the file name of the css match the file name of the php (ie thumbnails.php and thumbnails.css)??

you can add a thumbnail size directly in the the_post_thumbnail() code (in line 25 of the pastebin);

https://codex.www.ads-software.com/Function_Reference/the_post_thumbnail

there is more info in the Codex chapter I linked earlier.

do you know how I can incorporate the css on that page with the template file? I have uploaded it in the childtheme folder I have set up but I don’t know how to make that page load the css file.
if you look at this page he has included css but I just need to know how to make it work with my page

https://matthiaspabst.de/wordpress-thumbnailseite-mit-artikelbildern/

as these are all specific styles, you could just add them to the end of style.css in your child theme.

That’s what I thought so I tried it and it’s not doing anything…
https://pastebin.com/9m4zCxde

whatever text editor you might have used to paste the css into the stylesheet, has totally altered the code;

it should look like:

/* Post Thumbnail Grid */
.gridcontainer h2 a{color: #333; font-size: 13px;}
.gridcontainer .griditemleft{float: left; width: 150px; margin: 0 30px 20px 0;}
.gridcontainer .griditemright{float: left; width: 150px;}
.gridcontainer .postimage{margin: 0 0 5px 0;}
.gridcontainer .postimage-title {text-align: center;}

I take that back…it has added thumbnails to the posts on my main page