Common
```kotlin
@JvmDefaultWithCompatibility
interface Vertical
```
Used to specify the vertical arrangement of the layout's children in layouts like [Column](/jetpack-compose/androidx.compose.foundation/foundation-layout/composable-functions/Column).
## Properties
Common
```kotlin
val spacing
```
Spacing that should be added between any two adjacent layout children.
## Functions
arrange
```kotlin
fun Density.arrange(totalSize: Int, sizes: IntArray, outPositions: IntArray)
```
Vertically places the layout children.
#### Parameters
| | |
| --- | --- |
| totalSize | Available space that can be occupied by the children, in pixels. |
| sizes | An array of sizes of all children, in pixels. |
| outPositions | An array of the size of `sizes` that returns the calculated positions relative to the top, in pixels. |