Drupal 8.x

I have a drupal 8 version site (work on progress) and added a bannerslider in the top-header region.
and nothing in the left and right region in the top.

How can I center the Image above the side (now it is alligned left
Tried several bootstrap tricks but with no succes fo far

I am working towards upgrading from D7 to D8 and am now doing practice runs.

I found some weirdly named empty files in sites/default/files named like ewrecrupodupustaprurichilichopharalusachewoclobo , without an extention and with different number of characters for each file.

Any idea of what is going on?

I install manually, without composer and without drush.

I have installed commerce and the plugins with ludwig, webform still needs plugins installed.

EDIT:

New ones get created immediately after deleting...

Folks may have seen recent posts from me asking various twig/class questions as I tried to get my desired home page with a main content section showing article teaser in the Bootstrap Card format.  I finally think I settled on an almost completely out of the box solution using minimal hacks.

The first part of my solution was realizing that if I do NOT use layouts for an article view mode then I get the bootstrap card layout formats in the layout drop-down. That got me my first significant progress.

I have a content type - PSD_availability: It has the below fields:

1. Program_ID

2.Entity reference to PSD_type1 paragraph type

PSD_type1 paragraph type has the below fields:

1. Program_ID

2.Age_group

3. Education level

On th ebackend I have all these data in a table PSD_data. I would like to import all of this table data into PSD_typ1 paragraph and PSD_availability content type. Is there any easy way to do this? I am aware of the feeds  paragraph module but that is not available for D8 yet.

The batch update script for the modules froze with two modules left and stayed frozen for the whole day so I had to abort, I updated the core (manually) and tried again. The database update script now reports an error with the Geocoder module:

ReflectionException: Class Drupal\geocoder\ProviderPluginManager does not exist in ReflectionClass->__construct() (linje 1174 i [my site]/vendor/symfony/dependency-injection/ContainerBuilder.php).

I had not read drupal 8.8 release notes before updating to latest drupal core, so now I get an error running update.php:

"The Pathauto module is not compatible with the current version of Drupal core. Update the Pathauto module to 8.x-1.6 or later."

Will deleting the existing pathauto module directory and extracting the latest version suffice?