## layout

```
<Flex>
  <Item>
    <Button/>
  </Item>
  <Item>
    <Button/>
  </Item>
  <Item>
    <Button/>
  </Item>
</Flex>
```

### content container - Coat

Where to put content at the container.

```
<Coat><Button/></Coat>
```

coat: (w1, h1), content: (w2, h2)

w1 >= w1
h1 >= h2

relative position (x, y): content related to coat.

### layout container