diff --git a/crates/anstyle-svg/src/lib.rs b/crates/anstyle-svg/src/lib.rs
index 0cb8491a..e3756847 100644
--- a/crates/anstyle-svg/src/lib.rs
+++ b/crates/anstyle-svg/src/lib.rs
@@ -414,7 +414,7 @@ fn write_effects_in_use(buffer: &mut String, elements: &[adapter::Element]) {
         .unwrap();
     }
     if effects_in_use.contains(anstyle::Effects::DIMMED) {
-        writeln!(buffer, r#"    .dimmed {{ opacity: 0.7; }}"#).unwrap();
+        writeln!(buffer, r#"    .dimmed {{ opacity: 0.4; }}"#).unwrap();
     }
     if effects_in_use.contains(anstyle::Effects::HIDDEN) {
         writeln!(buffer, r#"    .hidden {{ opacity: 0; }}"#).unwrap();
diff --git a/crates/anstyle-svg/tests/rainbow.html b/crates/anstyle-svg/tests/rainbow.html
index 65cff278..411df179 100644
--- a/crates/anstyle-svg/tests/rainbow.html
+++ b/crates/anstyle-svg/tests/rainbow.html
@@ -786,7 +786,7 @@
     .dotted-underline { text-decoration-line: underline; text-decoration-style: dotted; }
     .dashed-underline { text-decoration-line: underline; text-decoration-style: dashed; }
     .strikethrough { text-decoration-line: line-through; }
-    .dimmed { opacity: 0.7; }
+    .dimmed { opacity: 0.4; }
     .hidden { opacity: 0; }
     span {
       font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
diff --git a/crates/anstyle-svg/tests/rainbow.svg b/crates/anstyle-svg/tests/rainbow.svg
index 26fdc13d..dce7656d 100644
--- a/crates/anstyle-svg/tests/rainbow.svg
+++ b/crates/anstyle-svg/tests/rainbow.svg
@@ -782,7 +782,7 @@
     .dotted-underline { text-decoration-line: underline; text-decoration-style: dotted; }
     .dashed-underline { text-decoration-line: underline; text-decoration-style: dashed; }
     .strikethrough { text-decoration-line: line-through; }
-    .dimmed { opacity: 0.7; }
+    .dimmed { opacity: 0.4; }
     .hidden { opacity: 0; }
     tspan {
       font: 14px SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;