diff --git a/themes/hugo-casper3/assets/scss/custom.scss b/themes/hugo-casper3/assets/scss/custom.scss
index e57fef1..69b2d83 100644
--- a/themes/hugo-casper3/assets/scss/custom.scss
+++ b/themes/hugo-casper3/assets/scss/custom.scss
@@ -262,13 +262,13 @@
             padding-bottom: 10px;
         }
     }
-    .isso-postbox > .form-wrapper .preview,
-    .isso-postbox > .form-wrapper input[name="edit"],
-    .isso-postbox.preview-mode > .form-wrapper input[name="preview"],
-    .isso-postbox.preview-mode > .form-wrapper .textarea {
+    > .form-wrapper .preview,
+    > .form-wrapper input[name="edit"],
+    &.preview-mode > .form-wrapper input[name="preview"],
+    &.preview-mode > .form-wrapper .textarea {
         display: none;
     }
-    .isso-postbox.preview-mode > .form-wrapper{
+    &.preview-mode > .form-wrapper{
         .preview {
             display: block;
         }