Notebook Terminal does not use --marimo-monospace-font (or any other css var from custom.css)

[susl]

Describe the bug

I wanted to open a terminal in Marimo, but my prompt was messed up, because I'm using nerd font and xterm in marimo could not render in properly.

I tried configuring --marimo-monospace-font as the documentation says it's the font used for code blocks, so I assume terminal would use it as well. But it does not, an it appears that there's no proper way to configure it.

For now, I did this in custom.css, but it's hacky:

@import url("https://mshaugh.github.io/nerdfont-webfonts/build/firacode-nerd-font.css");
.xterm-rows {
    font-family: "FiraCode Nerd Font", monospace !important;
}

Environment

{
"marimo": "0.9.26",
"OS": "Darwin",
"OS Version": "24.1.0",
"Processor": "i386",
"Python Version": "3.13.0",
"Binaries": {
"Browser": "131.0.6778.86",
"Node": "v23.3.0"
},
"Dependencies": {
"click": "8.1.7",
"docutils": "0.21.2",
"itsdangerous": "2.2.0",
"jedi": "0.19.2",
"markdown": "3.7",
"narwhals": "1.14.2",
"packaging": "24.2",
"psutil": "6.1.0",
"pygments": "2.18.0",
"pymdown-extensions": "10.12",
"pyyaml": "6.0.2",
"ruff": "0.8.0",
"starlette": "0.41.3",
"tomlkit": "0.13.2",
"typing-extensions": "missing",
"uvicorn": "0.32.1",
"websockets": "14.1"
},
"Optional Dependencies": {}
}

Code to reproduce

app = marimo.App(width="medium", css_file="custom.css")

and

@import url("https://mshaugh.github.io/nerdfont-webfonts/build/firacode-nerd-font.css");
:root {
    font-family: "FiraCode Nerd Font", monospace !important;
}