diff --git a/website/_harp.json b/website/_harp.json
index a0970c11d..c1db644db 100644
--- a/website/_harp.json
+++ b/website/_harp.json
@@ -47,7 +47,7 @@
             }
         },
 
-        "V_CSS": "1.4",
+        "V_CSS": "1.5",
         "V_JS": "1.0",
         "DEFAULT_SYNTAX" : "python",
         "ANALYTICS": "UA-58931649-1",
diff --git a/website/assets/css/_components/_tables.sass b/website/assets/css/_components/_tables.sass
index b2c8edeaa..491552c62 100644
--- a/website/assets/css/_components/_tables.sass
+++ b/website/assets/css/_components/_tables.sass
@@ -10,7 +10,7 @@
 
 .c-table__row
     &:nth-child(odd)
-        background: lighten($color-subtle-light, 2)
+        background: rgba($color-subtle-light, 0.35)
 
     &.c-table__row--foot
         background: $color-subtle-light