reduce space beetween thumbnails and title

You would be better off asking questions on the dedicated support forum at https://aquoid.com/forum/

In this case providing you don’t intend to change anything else put the following code in Suffusion Options > backend > custom includes > custom styles

.suf-tile-image {
  height: 100px;
}

works! Thank you.
Maybe you have also a hint for my other ugly unsolved problem with padding ->
https://www.ads-software.com/support/topic/padding-event-description

That would be great. Thanks.