I'm quite handy in modifying HTML and I have done so with my other blog: http://justintuijl.blogspot.co.uk/
At least this makes the standard Blogger templates not too bad. However this is quite time consuming and the template is not mobile responsive; for this it relies on the Blogger responsive app, which is a little primitive.
Did you know that you can apply many 3rd party mobile responsive templates to Blogger? Yes you can!
The blog you are reading uses a free prebuilt template from: https://btemplates.com/
See the template readme file to install.
This template is called Greatmag Blogger Template: https://btemplates.com/2016/blogger-template-greatmag/
If you are new to coding: be careful & keep backups.