To group multiple blocks into one block, use the Group block. With the Group block, you can customize foreground color for the elements inside, and the background color for the group.
If you want to display blocks side by side, use the Columns block. The Columns block adds the ability to create two or more columns with different ratios / sizes.
If you need more customization of the positioning of the elements within a group, you can instead use an Advanced Columns block. Advanced Columns let’s you do everything a Columns block would do, but also includes margin, padding, and background image functionality.