diff --git a/.changeset/silver-teeth-stand.md b/.changeset/silver-teeth-stand.md
new file mode 100644
index 00000000..e11dba5e
--- /dev/null
+++ b/.changeset/silver-teeth-stand.md
@@ -0,0 +1,5 @@
+---
+"@devup-ui/wasm": patch
+---
+
+Fix className
diff --git a/libs/extractor/src/lib.rs b/libs/extractor/src/lib.rs
index 7dc9233a..02764c56 100644
--- a/libs/extractor/src/lib.rs
+++ b/libs/extractor/src/lib.rs
@@ -2673,6 +2673,45 @@ e(o, { className: "a", bg: variable, style: { color: "blue" }, ...props })
         ));
     }
 
+    #[test]
+    #[serial]
+    fn props_multi_expression() {
+        reset_class_map();
+        assert_debug_snapshot!(ToBTreeSet::from(
+            extract(
+                "test.jsx",
+                r#"import {
+  Box,
+  Button as DevupButton,
+  Center,
+  css,
+} from '@devup-ui/core'
+
+<DevupButton
+    border={
+    {
+        primary: 'none',
+        default: '1px solid var(--border, #E4E4E4)',
+    }[variant]
+    }
+    className={className}
+    px={
+    {
+        false: { sm: '12px', md: '16px', lg: '20px' }[size],
+        true: { sm: '24px', md: '28px', lg: '32px' }[size],
+    }[(!!icon).toString()]
+    }
+/>
+"#,
+                ExtractOption {
+                    package: "@devup-ui/core".to_string(),
+                    css_file: None
+                }
+            )
+            .unwrap()
+        ));
+    }
+
     #[test]
     #[serial]
     fn props_direct_object_select() {
@@ -3161,6 +3200,40 @@ import {Button} from '@devup/ui'
             )
             .unwrap()
         ));
+
+        reset_class_map();
+        assert_debug_snapshot!(ToBTreeSet::from(
+            extract(
+                "test.jsx",
+                r#"import {Box} from '@devup-ui/core'
+    <Box className={`  ${1} ${2}  `} />
+            "#,
+                ExtractOption {
+                    package: "@devup-ui/core".to_string(),
+                    css_file: None
+                }
+            )
+            .unwrap()
+        ));
+
+        reset_class_map();
+        assert_debug_snapshot!(ToBTreeSet::from(
+            extract(
+                "test.jsx",
+                r#"import {Box} from '@devup-ui/core'
+    <Box className={`  ${1} ${2}  `}
+    _hover={{bg:"red"}}
+    _themeDark={{ _hover:{bg:"black"} }}
+    
+     />
+            "#,
+                ExtractOption {
+                    package: "@devup-ui/core".to_string(),
+                    css_file: None
+                }
+            )
+            .unwrap()
+        ));
     }
 
     #[test]
diff --git a/libs/extractor/src/prop_modify_utils.rs b/libs/extractor/src/prop_modify_utils.rs
index e653403f..16290ea8 100644
--- a/libs/extractor/src/prop_modify_utils.rs
+++ b/libs/extractor/src/prop_modify_utils.rs
@@ -233,7 +233,12 @@ fn merge_string_expressions<'a>(
     if expressions.is_empty() {
         return None;
     }
-    if expressions.len() == 1 {
+    if expressions.len() == 1
+        && !matches!(
+            expressions.first().unwrap(),
+            Expression::StringLiteral(_) | Expression::TemplateLiteral(_)
+        )
+    {
         return Some(expressions.first().unwrap().clone_in(ast_builder.allocator));
     }
 
@@ -241,41 +246,70 @@ fn merge_string_expressions<'a>(
     let mut other_expressions = vec![];
     let mut prev_str = String::new();
     for (idx, ex) in expressions.iter().enumerate() {
-        if let Expression::StringLiteral(literal) = ex {
-            if !prev_str.trim().is_empty() {
-                prev_str.push(' ');
+        match ex {
+            Expression::StringLiteral(literal) => {
+                prev_str.push_str(
+                    format!(
+                        "{}{}",
+                        if prev_str.trim().is_empty() && other_expressions.is_empty() {
+                            ""
+                        } else {
+                            " "
+                        },
+                        literal.value.trim()
+                    )
+                    .as_str(),
+                );
             }
-            prev_str.push_str(literal.value.trim());
-        } else if let Expression::TemplateLiteral(template) = ex {
-            for (idx, q) in template.quasis.iter().enumerate() {
-                if idx == 0 {
-                    if !prev_str.trim().is_empty() {
-                        prev_str.push(' ');
-                    }
-                    prev_str.push_str(&q.value.raw);
-                } else {
-                    if !prev_str.trim().is_empty() {
-                        string_literals.push(prev_str.clone());
-                    }
-                    if q.tail {
-                        prev_str = format!("{} ", q.value.raw);
+            Expression::TemplateLiteral(template) => {
+                for (idx, q) in template.quasis.iter().enumerate() {
+                    if !prev_str.is_empty() {
+                        string_literals.push(format!(
+                            "{}{}{}{}",
+                            prev_str.trim(),
+                            if !prev_str.trim().is_empty() { " " } else { "" },
+                            q.value.raw.trim(),
+                            if idx == template.quasis.len() - 1 {
+                                ""
+                            } else {
+                                " "
+                            }
+                        ));
+                        prev_str = String::new();
+                    } else if q.tail {
+                        prev_str = q.value.raw.trim().to_string();
                     } else {
-                        string_literals.push(q.value.raw.into());
+                        string_literals.push(format!(
+                            "{}{}{}",
+                            if idx == 0
+                                && other_expressions.is_empty()
+                                && string_literals.is_empty()
+                            {
+                                ""
+                            } else {
+                                " "
+                            },
+                            q.value.raw.trim(),
+                            if q.value.raw.trim().is_empty() || !q.value.raw.ends_with(' ') {
+                                ""
+                            } else {
+                                " "
+                            }
+                        ));
                         prev_str = String::new();
                     }
                 }
+                other_expressions.extend(template.expressions.clone_in(ast_builder.allocator));
             }
-            other_expressions.extend(template.expressions.clone_in(ast_builder.allocator));
-        } else {
-            if !prev_str.ends_with(' ') {
-                string_literals.push(format!("{}{}", prev_str, if idx > 0 { " " } else { "" }));
-            } else if idx > 0 {
-                string_literals.push(" ".to_string());
-            } else {
-                string_literals.push("".to_string());
+            ex => {
+                string_literals.push(format!(
+                    "{}{}",
+                    prev_str.trim(),
+                    if idx > 0 { " " } else { "" }
+                ));
+                other_expressions.push(ex.clone_in(ast_builder.allocator));
+                prev_str = String::new();
             }
-            other_expressions.push(ex.clone_in(ast_builder.allocator));
-            prev_str = " ".to_string();
         }
     }
     if !prev_str.is_empty() {
diff --git a/libs/extractor/src/snapshots/extractor__tests__props_multi_expression.snap b/libs/extractor/src/snapshots/extractor__tests__props_multi_expression.snap
new file mode 100644
index 00000000..0fbb58e2
--- /dev/null
+++ b/libs/extractor/src/snapshots/extractor__tests__props_multi_expression.snap
@@ -0,0 +1,81 @@
+---
+source: libs/extractor/src/lib.rs
+expression: "ToBTreeSet::from(extract(\"test.jsx\",\nr#\"import {\n  Box,\n  Button as DevupButton,\n  Center,\n  css,\n} from '@devup-ui/core'\n\n<DevupButton\n    border={\n    {\n        primary: 'none',\n        default: '1px solid var(--border, #E4E4E4)',\n    }[variant]\n    }\n    className={className}\n    px={\n    {\n        false: { sm: '12px', md: '16px', lg: '20px' }[size],\n        true: { sm: '24px', md: '28px', lg: '32px' }[size],\n    }[(!!icon).toString()]\n    }\n/>\n\"#,\nExtractOption\n{ package: \"@devup-ui/core\".to_string(), css_file: None }).unwrap())"
+---
+ToBTreeSet {
+    styles: {
+        Static(
+            ExtractStaticStyle {
+                property: "border",
+                value: "1px solid var(--border,#E4E4E4)",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "border",
+                value: "none",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "12px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "16px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "20px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "24px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "28px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "px",
+                value: "32px",
+                level: 0,
+                selector: None,
+                style_order: None,
+            },
+        ),
+    },
+    code: "import \"@devup-ui/core/devup-ui.css\";\n<button className={`${className || \"\"} ${{\n\t\"default\": \"d0\",\n\t\"primary\": \"d1\"\n}[variant] || \"\"} ${{\n\t\"false\": {\n\t\t\"lg\": \"d2\",\n\t\t\"md\": \"d3\",\n\t\t\"sm\": \"d4\"\n\t}[size] || \"\",\n\t\"true\": {\n\t\t\"lg\": \"d5\",\n\t\t\"md\": \"d6\",\n\t\t\"sm\": \"d7\"\n\t}[size] || \"\"\n}[(!!icon).toString()]}`} />;\n",
+}
diff --git a/libs/extractor/src/snapshots/extractor__tests__template_literal_props-5.snap b/libs/extractor/src/snapshots/extractor__tests__template_literal_props-5.snap
new file mode 100644
index 00000000..7001e39a
--- /dev/null
+++ b/libs/extractor/src/snapshots/extractor__tests__template_literal_props-5.snap
@@ -0,0 +1,8 @@
+---
+source: libs/extractor/src/lib.rs
+expression: "ToBTreeSet::from(extract(\"test.jsx\",\nr#\"import {Box} from '@devup-ui/core'\n    <Box className={`  ${1} ${2}  `} />\n            \"#,\nExtractOption\n{ package: \"@devup-ui/core\".to_string(), css_file: None }).unwrap())"
+---
+ToBTreeSet {
+    styles: {},
+    code: "<div className={`${1} ${2}`} />;\n",
+}
diff --git a/libs/extractor/src/snapshots/extractor__tests__template_literal_props-6.snap b/libs/extractor/src/snapshots/extractor__tests__template_literal_props-6.snap
new file mode 100644
index 00000000..4d8da554
--- /dev/null
+++ b/libs/extractor/src/snapshots/extractor__tests__template_literal_props-6.snap
@@ -0,0 +1,35 @@
+---
+source: libs/extractor/src/lib.rs
+expression: "ToBTreeSet::from(extract(\"test.jsx\",\nr#\"import {Box} from '@devup-ui/core'\n    <Box className={`  ${1} ${2}  `}\n    _hover={{bg:\"red\"}}\n    _themeDark={{ _hover:{bg:\"black\"} }}\n    \n     />\n            \"#,\nExtractOption\n{ package: \"@devup-ui/core\".to_string(), css_file: None }).unwrap())"
+---
+ToBTreeSet {
+    styles: {
+        Static(
+            ExtractStaticStyle {
+                property: "background",
+                value: "black",
+                level: 0,
+                selector: Some(
+                    Selector(
+                        ":root[data-theme=dark] &:hover",
+                    ),
+                ),
+                style_order: None,
+            },
+        ),
+        Static(
+            ExtractStaticStyle {
+                property: "background",
+                value: "red",
+                level: 0,
+                selector: Some(
+                    Selector(
+                        "&:hover",
+                    ),
+                ),
+                style_order: None,
+            },
+        ),
+    },
+    code: "import \"@devup-ui/core/devup-ui.css\";\n<div className={`${1} ${2} d0 d1`} />;\n",
+}