Add gradio classes to widgets

src/lib/widgets/ComboWidget.svelte

@@ -20,7 +20,7 @@
  }
 </script>
 
-<div class="wrapper">
+<div class="wrapper gr-combo">
     {#if item !== null && option !== undefined}
         <label>
             <BlockTitle show_label={true}>{item.widget.name}</BlockTitle>

src/lib/widgets/ComfyGalleryWidget.svelte

@@ -33,7 +33,7 @@
  }
 
 </script>
-<div class="wrapper comfy-gallery-widget" bind:this={element}>
+<div class="wrapper comfy-gallery-widget gr-gallery" bind:this={element}>
     {#if item && itemValue}
         <Block variant="solid" padding={false}>
             <Gallery

src/lib/widgets/RangeWidget.svelte

@@ -22,7 +22,7 @@
  }
 </script>
 
-<div class="wrapper">
+<div class="wrapper gr-range">
     {#if item && option}
         <Range
             bind:value={option}

src/lib/widgets/TextWidget.svelte

@@ -6,7 +6,7 @@
  $: if (item) { itemValue = item.value; }
 </script>
 
-<div class="wrapper">
+<div class="wrapper gr-textbox">
     {#if item !== null && itemValue !== null}
         <TextBox
             bind:value={$itemValue}