Unexpected symbol 'float'

Not sure what I've done wrong. I'm actually watching a tutorial and I copied the exact same script, but it thinks that 'float' is an unexpected symbol. -

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class CameraController : MonoBehaviour {

 public Transform target; 

 public Vector3 offset;

 public float rotateSpeed;

 // Use this for initialization
 void Start () {
        offset = target.position - transform.position;
 }
 
 // Update is called once per frame
 void Update () {

     //Get the X position of the mouse & rotate the target
     float horizontal = Input.GetAxis("Mouse X") * rotateSpeed; 
     target.Rotate(0, horizontal, 0);

     float vertical = Input.GetAxis("Mouse Y") * rotateSpeed;
     target.Rotate(vertical, 0, 0)

     //Move the camera based on the current rotation of the target & the original offset
     float desiredYAngle = target.eulerAngles.y; 
     float desiredXAngle = target.eulerAngles.x;
     Quaternion rotation = Quaternion.Euler(desiredXAngle, desiredYAngle, 0);
     transform.position = target.position - (rotation * offset);

     //transform.position = target.position - offset;

     transform.LookAt(target);
 }

}