Sure, here's some example CSS code to style the table:

```css
body {
  font-family: Arial, Helvetica, sans-serif;
}

tr:first-child {
  font-weight: 700;
  font-size: 20px;
}

td:first-child {
  font-weight: 500;
}

td {
  padding: 8px;
  background: #ccc;
}
```

you can embed CSS in your HTML file by putting it inside a `<style>` tag in the `<head>`, or by storing the style in a separate `.css` file and importing it using the link tag like this:
```html
<link rel="stylesheet" href="filename.css">
```
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