diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateHorizontal.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateHorizontal.swift
index 7c2976f1..9de34cf0 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateHorizontal.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateHorizontal.swift
@@ -107,6 +107,9 @@ public struct VwrCandidateHorizontal: View {
       .fixedSize(horizontal: false, vertical: true)
     }
     .frame(minWidth: thePool.maxWindowWidth, maxWidth: thePool.maxWindowWidth)
+    .overlay(
+      RoundedRectangle(cornerRadius: 10).stroke(.white.opacity(0.2), lineWidth: 1)
+    )
     .cornerRadius(10)
   }
 }
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateVertical.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateVertical.swift
index 87949c8c..aa55f2ed 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateVertical.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateVertical.swift
@@ -110,6 +110,9 @@ public struct VwrCandidateVertical: View {
         )
       }
     }
+    .overlay(
+      RoundedRectangle(cornerRadius: 10).stroke(.white.opacity(0.2), lineWidth: 1)
+    )
     .cornerRadius(10)
   }
 }
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateHorizontalBackports.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateHorizontalBackports.swift
index 8b70b578..9a3924d9 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateHorizontalBackports.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateHorizontalBackports.swift
@@ -112,6 +112,9 @@ public struct VwrCandidateHorizontalBackports: View {
       .fixedSize(horizontal: false, vertical: true)
     }
     .frame(minWidth: thePool.maxWindowWidth, maxWidth: thePool.maxWindowWidth)
+    .overlay(
+      RoundedRectangle(cornerRadius: 10).stroke(.white.opacity(0.2), lineWidth: 1)
+    )
     .cornerRadius(10)
   }
 }
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateVerticalBackports.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateVerticalBackports.swift
index 0b30fa87..bd1a7aba 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateVerticalBackports.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates_Backports/VwrCandidateVerticalBackports.swift
@@ -115,6 +115,9 @@ public struct VwrCandidateVerticalBackports: View {
         )
       }
     }
+    .overlay(
+      RoundedRectangle(cornerRadius: 10).stroke(.white.opacity(0.2), lineWidth: 1)
+    )
     .cornerRadius(10)
   }
 }