Center element of scroll list

ScrollRectExtension.cs

using UnityEngine;
using UnityEngine.UI;

public static class ScrollRectExtensions
{
  public static void SnapTo (this ScrollRect rect, Transform target)
  {
    rect.content.anchoredPosition = rect.transform.InverseTransformPoint (rect.content.position) - rect.transform.InverseTransformPoint (target.position);
  }
}