# Hex color notation have an alpha channel

The hex color notation can be described as `#RGB[A]`

or `#RRGGBB[AA]`

- it accepts an alpha channel that can be used to represent the transparency.

When using it as `#RRGGBB[AA]`

, the alpha channel is a hexadecimal number where `00`

is full transparent and `FF`

full opaque. If using the shorter `#RGB[A]`

notation, it is a hexadecimal number ranging from `0`

and `F`

.

```
#FF7f00 /* orange */
#FF7f0000 /* orange 0% opaque */
#FF7f0080 /* orange 50% opaque */
#FF7f00FF /* orange 100% opaque */
#01E /* blue */
#01E0 /* blue 0% opaque */
#01E8 /* blue 53% opaque */
#01EF /* blue 100% opaque */
```

You can find out more on MDN.