The object following the camera is shaking

Hello everyone.I want an object (background) to follow the camera, but it's shaking. I want to know how to make it move smoothly.

I'm new to unity, so any help will be appreciated`(>﹏<)′

 public Transform camera;
     
     void Update()
     {
         transform.position = new Vector3(camera.position.x, 0, -1);
     }

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