diff --git a/src/main/TrackSelection.tsx b/src/main/TrackSelection.tsx
index d26985f0c..8239823da 100644
--- a/src/main/TrackSelection.tsx
+++ b/src/main/TrackSelection.tsx
@@ -191,13 +191,13 @@ const SelectButton: React.FC<selectButtonInterface> = ({ handler, text, Icon, to
 
   const buttonStyle = [
     active ? basicButtonStyle(theme) : deactivatedButtonStyle,
-    {
+    css({
       padding: "16px",
       maxHeight: "21px",
       boxShadow: "",
       background: `${theme.element_bg}`,
       textWrap: "nowrap",
-    }];
+    })];
 
   const clickHandler = () => {
     if (active) { handler(); }
diff --git a/src/redux/videoSlice.ts b/src/redux/videoSlice.ts
index e8884c8eb..c3532b6a4 100644
--- a/src/redux/videoSlice.ts
+++ b/src/redux/videoSlice.ts
@@ -505,7 +505,7 @@ const setThumbnailHelper = (state: video, id: Track["id"], uri: Track["thumbnail
 
 const ZOOM_SECONDS_VISIBLE = 20 * 1000;
 
-function timelineZoomMax(state) {
+function timelineZoomMax(state: { duration: number }) {
   const maxZoom = state.duration / ZOOM_SECONDS_VISIBLE;
 
   return Math.max(2, Math.ceil(maxZoom));