How to override block style inside theme

Lets override style of blog-1 block

.
├── wp-content/themes/themename
|   ├── onepager
|   |   ├── overrides
|   |   |   ├── blog-1
|   |   |   |   ├── block.css

1. create blog-1 folder inside themename/onepagger/overrides and put block.css file
2. you can copy the contents of tx-onepager/blocks/blog-1/block.css and paste in your block.css file
3. keep whatever you want