update

Packages/app.rive.rive-unity/Editor/Components/Styles/RiveInspectorStyleSheet.uss

@@ -0,0 +1,62 @@
+.rive-inspector {
+    padding-top: 9px;
+}
+
+.rive-inspector__section {
+    margin-bottom: 9px;
+    margin-top: 3px;
+}
+
+.rive-inspector__foldout {
+}
+
+.rive-inspector__field {
+    margin-bottom: 3px;
+    margin-left: 3px;
+}
+.rive-inspector__field > Label {
+    min-width: 117px;
+}
+
+.rive-inspector__field-container {
+    flex-direction: row;
+    align-items: center;
+}
+
+.rive-inspector__field-content {
+    flex: 1 1 auto;
+}
+
+.rive-inspector__field-help-button {
+    width: 20px;
+    height: 20px;
+    padding: 0;
+    margin-left: 4px;
+    flex-shrink: 0;
+    justify-content: center;
+    align-items: center;
+    background-color: rgba(0, 0, 0, 0);
+    border-width: 0;
+}
+
+.rive-inspector__field-help-button > Image {
+    width: 14px;
+    height: 14px;
+}
+
+.rive-inspector__field-help-button:hover {
+    background-color: rgba(0, 0, 0, 0.08);
+}
+
+.rive-inspector__section-label {
+    -unity-font-style: bold;
+    margin-bottom: 4px;
+   margin-left: 5.2px;
+
+}
+
+.unity-foldout__input > Label {
+    -unity-font-style: bold;
+       margin-left: 1px;
+
+}

Packages/app.rive.rive-unity/Editor/Components/Styles/RiveInspectorStyleSheet.uss.meta

@@ -0,0 +1,18 @@
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+  packageName: Rive
+  packageVersion: 0.4.2
+  assetPath: Packages/app.rive.rive-unity/Editor/Components/Styles/RiveInspectorStyleSheet.uss
+  uploadId: 896810

Packages/app.rive.rive-unity/Editor/Components/Styles/StyleHelper.cs

@@ -0,0 +1,63 @@
+using UnityEditor;
+using UnityEngine.UIElements;
+
+namespace Rive
+{
+    /// <summary>
+    /// Helper class for styling Rive components.
+    /// </summary>
+    internal class StyleHelper
+    {
+        // USS Class Names
+        /// <summary>
+        /// The block class name for the Rive inspector.
+        /// </summary>
+        public const string CLASS_BLOCK = "rive-inspector";
+
+        /// <summary>
+        /// The element class name for sections within the Rive inspector.
+        /// </summary>
+        public const string CLASS_SECTION = "rive-inspector__section";
+
+        /// <summary>
+        /// The element class name for section labels within the Rive inspector.
+        /// </summary>
+        public const string CLASS_SECTION_LABEL = "rive-inspector__section-label";
+
+        /// <summary>
+        /// The element class name for fields within the Rive inspector.
+        /// </summary>
+        public const string CLASS_FIELD = "rive-inspector__field";
+
+        /// <summary>
+        /// Container that wraps a field and its optional help button.
+        /// </summary>
+        public const string CLASS_FIELD_CONTAINER = "rive-inspector__field-container";
+
+        /// <summary>
+        /// Class name applied to the primary field element inside a container.
+        /// </summary>
+        public const string CLASS_FIELD_CONTENT = "rive-inspector__field-content";
+
+        /// <summary>
+        /// Class name applied to the help/info buttons.
+        /// </summary>
+        public const string CLASS_FIELD_HELP_BUTTON = "rive-inspector__field-help-button";
+
+
+        private static StyleSheet s_StyleSheet;
+
+        public static StyleSheet StyleSheet
+        {
+            get
+            {
+                if (s_StyleSheet == null)
+                {
+                    string ussPath = "Packages/app.rive.rive-unity/Editor/Components/Styles/RiveInspectorStyleSheet.uss";
+                    s_StyleSheet = AssetDatabase.LoadAssetAtPath<StyleSheet>(ussPath);
+                }
+                return s_StyleSheet;
+            }
+        }
+    }
+}

Packages/app.rive.rive-unity/Editor/Components/Styles/StyleHelper.cs.meta

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+  assetPath: Packages/app.rive.rive-unity/Editor/Components/Styles/StyleHelper.cs
+  uploadId: 896810