Static content in Yew is served from the static directory in your crate. For example, if you have a folder structure like:
myapp
├── src/
│ └── lib.rs
├── static/
│ └── script.js
├── Cargo.lock
└── Cargo.toml
Yew compiles to a single-page application, with one JavaScript bundle that can be imported into an HTML page. Yew generates boilerplate HTML page out of the box, but you can create a custom one in static/index.html if you wish to override this.
Your application will be built at /crate.js. For example, for your custom HTML page that imports some CSS, you might have:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My Awesome App!</title>
<!-- references /static/mystyles.css -->
<link rel="stylesheet" href="/mystyles.css">
</head>
<body>
<script src="/myapp.js"></script>
</body>
</html>A proposal for proper CSS support can be found here: yewstack/yew#533.
For now, you can reference stylesheets be creating a custom index.html within the static directory.