Improve :focus state style

1 files changed, 1 insertions, 1 deletions

diff --git a/src/comparison-sliders.less b/src/comparison-sliders.less
index 9c8f409..5007f70 100644
--- a/src/comparison-sliders.less
+++ b/src/comparison-sliders.less
@@ -78,7 +78,7 @@
     max-width: 100%;
     min-width: 1.6rem;
     opacity: 0;
-    outline: 0;
+    outline: none;
     position: relative;
     resize: horizontal;
     top: 50%;