Min Max Slider

Hi, I'm trying to make a Min Max Slider for a project. I managed to modify a bit a code that I found on Internet and it looks like this:
The problem is at image 2: When I have a "tree" of values, the float fields are a lot smaller and the slider too. Do you have any idea how to fix this ?

Code:

Code (CSharp):

1.  
2. public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
3.  
4.         if (property.serializedObject.isEditingMultipleObjects) return;
5.         float textFieldWidth = 100;
6.  
7.         Rect sliderPos = position;
8.         sliderPos.x += EditorGUIUtility.labelWidth + textFieldWidth;
9.         sliderPos.width -= EditorGUIUtility.labelWidth + textFieldWidth * 2;
10.  
11.         var minProperty = property.FindPropertyRelative("min");
12.         var maxProperty = property.FindPropertyRelative("max");
13.         var minmax = attribute as MinMaxSliderAttribute ?? new MinMaxSliderAttribute(0, 1);
14.  
15.         var min = minProperty.floatValue;
16.         var max = maxProperty.floatValue;
17.         EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
18.  
19.         Rect minPos = position;
20.         minPos.x += EditorGUIUtility.labelWidth;
21.         minPos.width = textFieldWidth;
22.         min = Mathf.Clamp(EditorGUI.FloatField(minPos, min), minmax.Min, max);
23.         Rect maxPos = position;
24.         maxPos.x += maxPos.width - textFieldWidth;
25.         maxPos.width = textFieldWidth;
26.         max = Mathf.Clamp(EditorGUI.FloatField(maxPos, max), min, minmax.Max);
27.  
28.         EditorGUI.MinMaxSlider(sliderPos, GUIContent.none, ref min, ref max, minmax.Min, minmax.Max);
29.  
30.         minProperty.floatValue = min;
31.         maxProperty.floatValue = max;
32.     }

Sorry for my bad english.