ADDED Font selection;

Marquee.cs

using UnityEngine;

public class Marquee : MonoBehaviour
{
    public string message = "Where we're going, we don't need roads.";
    public float scrollSpeed = 50;
    
    Rect messageRect;
    
    // Select your font in the Unity Inspector
    public Font f;
    
    void OnGUI ()
    {
        // Setting Font
		if(!f) {
			Debug.LogError("No font found, assign one in the inspector.");
			return;
		}
		GUI.skin.font = f;
        
        // Set up message's rect if we haven't already.
        if (messageRect.width == 0) {
            var dimensions = GUI.skin.label.CalcSize(new GUIContent(message));
            
            // Start message past the left side of the screen.
            messageRect.x = -dimensions.x;
            messageRect.width = dimensions.x;
            messageRect.height = dimensions.y;
        }
        
        messageRect.x += Time.deltaTime * scrollSpeed;
        
        // If message has moved past the right side, move it back to the left.
        if (messageRect.x > Screen.width) {
            messageRect.x = -messageRect.width;
        }
        
        GUI.Label(messageRect, message);
    }
}