Horizontal Scrolling Background

 using UnityEngine;
 
 //This script controls the scrolling of the background
 public class Background : MonoBehaviour
 {
     public float speed = 0.1f;            //Speed of the scrolling
     
     void Update ()
     {
         //Keep looping between 0 and 1
         float x = Mathf.Repeat (Time.time * speed, 1);
         //Create the offset
         Vector2 offset = new Vector3 (0, x);
         //Apply the offset to the material
         GetComponent<Renderer>().sharedMaterial.SetTextureOffset ("_MainTex", offset);
     }
 }

This allows my background to scroll vertically, but I'm trying to make it scroll horizontal. I tried changing the vectors, but it didn't do anything. Any help?