Sure, here is the same Kubernetes deployment YAML code formatted inside a code block with proper indentation:

```YAML
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
```

The code block preserves the indentation of the YAML code, making it easier to read and understand.
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