To center site content in CSS, you can use either the flexbox or grid method. For the flexbox method, you need to add display: flex to the container element, and then center the child element both vertically and horizontally by adding align-items: center and justify-content: center. The align-items property centers the child element vertically, while the justify-content property centers the child element horizontally.

Here's an example of the code you can use:
```css
.container {
  display: flex;
  align-items: center;
  justify-content: center;
}
```
If you prefer using the grid method, you can simply replace `display: flex` with `display: grid` in the code above.
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