diff --git a/test/__snapshots__/postprocess.test.ts.snap b/test/__snapshots__/postprocess.test.ts.snap
index f384f32..147cb80 100644
--- a/test/__snapshots__/postprocess.test.ts.snap
+++ b/test/__snapshots__/postprocess.test.ts.snap
@@ -2,12 +2,12 @@
 
 exports[`presetUseful postprocess with unColor > base 1`] = `
 "/* layer: default */
-.bg-red{--un-color:248,113,113;--un-bg-opacity:1;background-color:rgba(var(--un-color),var(--un-bg-opacity));}
-.text-blue{--un-color:96,165,250;--un-text-opacity:1;color:rgba(var(--un-color),var(--un-text-opacity));}"
+.bg-red{--un-bg-opacity:1;background-color:rgb(248 113 113 / var(--un-bg-opacity));}
+.text-blue{--un-text-opacity:1;color:rgb(96 165 250 / var(--un-text-opacity));}"
 `;
 
 exports[`presetUseful postprocess with unColor > with any string 1`] = `
 "/* layer: default */
-.bg-red{--test-color:248,113,113;--un-bg-opacity:1;background-color:rgba(var(--test-color),var(--un-bg-opacity));}
-.text-blue{--test-color:96,165,250;--un-text-opacity:1;color:rgba(var(--test-color),var(--un-text-opacity));}"
+.bg-red{--un-bg-opacity:1;background-color:rgb(248 113 113 / var(--un-bg-opacity));}
+.text-blue{--un-text-opacity:1;color:rgb(96 165 250 / var(--un-text-opacity));}"
 `;
diff --git a/test/postprocess.test.ts b/test/postprocess.test.ts
index 7301063..8785690 100644
--- a/test/postprocess.test.ts
+++ b/test/postprocess.test.ts
@@ -50,9 +50,9 @@ describe('presetUseful postprocess with important', () => {
     expect(css).toMatchInlineSnapshot(`
       "/* layer: default */
       .important-ma{margin:auto !important;}
-      .bg-red{--un-bg-opacity:1 !important;background-color:rgba(248,113,113,var(--un-bg-opacity)) !important;}
+      .bg-red{--un-bg-opacity:1 !important;background-color:rgb(248 113 113 / var(--un-bg-opacity)) !important;}
       .\\\\!text-xl{font-size:1.25rem !important;line-height:1.75rem !important;}
-      .text-blue{--un-text-opacity:1 !important;color:rgba(96,165,250,var(--un-text-opacity)) !important;}
+      .text-blue{--un-text-opacity:1 !important;color:rgb(96 165 250 / var(--un-text-opacity)) !important;}
       @media (min-width: 640px){
       .sm\\\\:text-sm\\\\!{font-size:0.875rem !important;line-height:1.25rem !important;}
       }"