How to edit a background of a list using EditorStyles

Question

I must change the list background texture, that list are located in a node I use the asset xNode to do that. That is the code of NodeEditor, is the class I use to edit the node layout.

using UnityEditor;
using UnityEngine;
using XNodeEditor;

[CustomNodeEditor(typeof(BaseNode))]
public class BaseNodeEditor : NodeEditor
{
    private static GUIStyle gl_label_normal;
    private static GUIStyle gl_label_bold;
    private static GUIStyle gl_header;

    private static GUIStyle gl_numberField;

    private static GUIStyle gl_objectField;

    public override void OnBodyGUI()
    {
        if (gl_label_normal == null) gl_label_normal = new GUIStyle(EditorStyles.label);
        if (gl_label_bold == null) gl_label_bold = new GUIStyle(EditorStyles.boldLabel);
        if (gl_numberField == null) gl_numberField = new GUIStyle(EditorStyles.numberField);
        if (gl_objectField == null) gl_objectField = new GUIStyle(EditorStyles.objectField);


        EditorStyles.objectField.normal.background = GetBackgroundTexture("#00000080");

        EditorStyles.numberField.normal.background = GetBackgroundTexture("#00000080");
        EditorStyles.numberField.normal.textColor = Color.white;

        EditorStyles.label.focused.textColor = Color.blue;
        EditorStyles.label.hover.textColor = Color.black;
        EditorStyles.label.normal.textColor = Color.black;
        EditorStyles.boldLabel.normal.textColor = Color.black;
        EditorStyles.boldLabel.hover.textColor = Color.black;

        base.OnBodyGUI();

        EditorStyles.label.normal = gl_label_normal.normal;
        EditorStyles.boldLabel.normal = gl_label_bold.normal;
        EditorStyles.numberField.normal = gl_numberField.normal;
        EditorStyles.objectField.normal = gl_objectField.normal;
    }
    
    public override void OnHeaderGUI()
    {
        if (gl_header == null) gl_header = new GUIStyle(NodeEditorResources.styles.nodeHeader);
        NodeEditorResources.styles.nodeHeader.normal.textColor = Color.black;
        base.OnHeaderGUI();
        NodeEditorResources.styles.nodeHeader.normal = gl_header.normal;
    }
    
    private Texture2D GetBackgroundTexture(string hexColor) {
        Color color = Color.white;
        ColorUtility.TryParseHtmlString(hexColor, out color);
        Texture2D texture = new Texture2D(1, 1);
        texture.SetPixel(0, 0, color);
        texture.Apply();
        return texture;
    }
}

I don't know how to do that, if some one knows please can help me?

I tryed to find in EditorStyles the element responsible to manage the background in list.

What I want is find the element responsible to change the list background texture.