Issue drawing lines between buttons - Lines overlap the buttons

I'm trying to draw lines between buttons, but the lines keep overlapping the buttons. I modified my script to draw the lines behind the buttons however they still overlap. Any ideas?

 using UnityEngine;
 using System.Collections;
 
 // This script draws lines between elements of the Bowtie display
 public class DrawLine : MonoBehaviour {
     private LineRenderer lineRenderer;
     private float counter;
     private float dist;
     private Vector3 aPos;
     private Vector3 bPos;
     public Transform origin;
     public Transform destination;
     public float lineDrawSpeed = 6f;
 
     // Use this for initialization
     void Start () {
         lineRenderer = GetComponent<LineRenderer>();
         aPos = new Vector3(origin.position.x, origin.position.y, origin.position.z + 0.2f); // Using these to move the lines back
         bPos = new Vector3(destination.position.x, destination.position.y, destination.position.z + 0.2f);
 
         lineRenderer.SetPosition(0, aPos);
         lineRenderer.SetWidth(.02f, .02f);
 
         dist = Vector3.Distance(origin.position, destination.position);
     }
     
     // Update is called once per frame
     void Update () {
 
         if(counter < dist){
             counter += .1f/lineDrawSpeed;
 
             float x = Mathf.Lerp(0, dist, counter);
 
             Vector3 pointA = aPos;
             Vector3 pointB = bPos;
 
             Vector3 pointAloneLine = x * Vector3.Normalize(pointB - pointA) + pointA;
 
             lineRenderer.SetPosition(1, pointAloneLine);
         }
     
     }
 }