diff --git a/lecture/lec19.md b/lecture/lec19.md
index 9aa445b..d49f44d 100644
--- a/lecture/lec19.md
+++ b/lecture/lec19.md
@@ -8,6 +8,6 @@ nav_exclude: true
 
 Presented by Alexander Strang
 
-- [Slides](https://docs.google.com/presentation/d/1Sih3nzuZS0pWBU4kXRdRQztU_RXpA6UHqTUlvHE0PyE/edit?usp=sharing)
+- [Slides](https://docs.google.com/presentation/d/1Sih3nzuZS0pWBU4kXRdRQztU_RXpA6UHqTUlvHE0PyE/edit?usp=sharing){:target="_blank"}
 - Notes: [Blank](https://drive.google.com/file/d/1byBQY6MGuI8lzkSWYVbttQgHKSDmcmRy/view?usp=drive_link){:target="_blank"}
 - Recording