How do I set more than one attribute for headers and footers?

Questions
1

The documentation shows this example:

#set page(
  paper: "us-letter",
  header: align(right)[
    A fluid dynamic model for
    glacier flow
  ],
  numbering: "1",
)
#set par(justify: true)
#set text(
  font: "Libertinus Serif",
  size: 11pt,
)

#lorem(600)

But I’d also like to colour the header text blue like this:

#set page(
  paper: "us-legal",
  header: text(font: "Barlow", size: 18pt, fill: color.linear-rgb(23, 55, 199))[
    A fluid *dynamic* model for   
    glacier flow
  ],
  numbering: "1",
)

How do I combine both the colour and alignment for the header?

2

Hello @Thomas_Browne, you can simply combine them in the same function call either writing

#align(right)[#text(blue)[text]]

or

#align(right, text(blue)[text])

See the parameter body of align, which is of type content.