diff --git a/src/unfold/contrib/import_export/forms.py b/src/unfold/contrib/import_export/forms.py
index b6ac9101..018a982c 100644
--- a/src/unfold/contrib/import_export/forms.py
+++ b/src/unfold/contrib/import_export/forms.py
@@ -4,6 +4,7 @@
 from import_export.forms import (
     SelectableFieldsExportForm as BaseSelectableFieldsExportForm,
 )
+
 from unfold.widgets import (
     SELECT_CLASSES,
     UnfoldAdminFileFieldWidget,
@@ -15,23 +16,37 @@ class ImportForm(BaseImportForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
-        self.fields["resource"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
-        self.fields["import_file"].widget = UnfoldAdminFileFieldWidget()
-        self.fields["format"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
+        self.fields["resource"].widget.attrs["class"] = " ".join(
+            [self.fields["resource"].widget.attrs.get("class", ""), *SELECT_CLASSES]
+        )
+        self.fields["import_file"].widget = UnfoldAdminFileFieldWidget(
+            attrs=self.fields["import_file"].widget.attrs
+        )
+        self.fields["format"].widget.attrs["class"] = " ".join(
+            [self.fields["format"].widget.attrs.get("class", ""), *SELECT_CLASSES]
+        )
 
 
 class ExportForm(BaseExportForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields["resource"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
-        self.fields["format"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
+        self.fields["resource"].widget.attrs["class"] = " ".join(
+            [self.fields["resource"].widget.attrs.get("class"), *SELECT_CLASSES]
+        )
+        self.fields["format"].widget.attrs["class"] = " ".join(
+            [self.fields["format"].widget.attrs.get("class"), *SELECT_CLASSES]
+        )
 
 
 class SelectableFieldsExportForm(BaseSelectableFieldsExportForm):
     def __init__(self, formats, resources, **kwargs):
         super().__init__(formats, resources, **kwargs)
-        self.fields["resource"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
-        self.fields["format"].widget.attrs["class"] = " ".join(SELECT_CLASSES)
+        self.fields["resource"].widget.attrs["class"] = " ".join(
+            [self.fields["resource"].widget.attrs.get("class"), *SELECT_CLASSES]
+        )
+        self.fields["format"].widget.attrs["class"] = " ".join(
+            [self.fields["format"].widget.attrs.get("class"), *SELECT_CLASSES]
+        )
 
         for _key, field in self.fields.items():
             if isinstance(field, BooleanField):
diff --git a/src/unfold/templates/unfold/widgets/clearable_file_input_small.html b/src/unfold/templates/unfold/widgets/clearable_file_input_small.html
index fa117e8e..f3bc2ca8 100644
--- a/src/unfold/templates/unfold/widgets/clearable_file_input_small.html
+++ b/src/unfold/templates/unfold/widgets/clearable_file_input_small.html
@@ -17,7 +17,7 @@
         <input type="text" value="{% if widget.value %}{{ widget.value.url }}{% else %}{% trans 'Choose file to upload' %}{% endif %}" disabled class="bg-white flex-grow font-medium px-3 py-2 text-ellipsis dark:bg-gray-900 {% if widget.value %}text-gray-500 dark:text-gray-400{% else %}text-gray-300 dark:text-gray-400{% endif %}">
 
         <div class="flex flex-none items-center leading-none self-stretch">
-            <input id="{{ widget.name }}" type="{{ widget.type }}" name="{{ widget.name }}" class="opacity-0 pointer-events-none" {% include "django/forms/widgets/attrs.html" %} />
+            <input id="{{ widget.name }}" type="{{ widget.type }}" name="{{ widget.name }}" class="{{ widget.file_input_class }}" {% include "django/forms/widgets/attrs.html" %} />
 
             <label for="{{ widget.name }}" class="cursor-pointer text-gray-400 px-3 hover:text-gray-700 dark:text-gray-500 dark:hover:text-gray-200">
                 <span class="material-symbols-outlined">file_upload</span>
diff --git a/src/unfold/widgets.py b/src/unfold/widgets.py
index 50c68b8f..d9f738ea 100644
--- a/src/unfold/widgets.py
+++ b/src/unfold/widgets.py
@@ -288,7 +288,18 @@ class FileFieldMixin:
     def get_context(self, name, value, attrs):
         widget = super().get_context(name, value, attrs)
         widget["widget"].update(
-            {"class": " ".join([*CHECKBOX_CLASSES, *["form-check-input"]])}
+            {
+                "class": " ".join([*CHECKBOX_CLASSES, *["form-check-input"]]),
+                "file_input_class": " ".join(
+                    [
+                        self.attrs.get("class", ""),
+                        *[
+                            "opacity-0",
+                            "pointer-events-none",
+                        ],
+                    ]
+                ),
+            }
         )
         return widget