fix: playhead height

gmus-web/src/components/ui/mobile/info.tsx

@@ -72,13 +72,14 @@ const TotalTime = styled(Time)`
 const Gutter = styled.div`
   display: flex;
   flex: 1;
-  height: 100%;
+  height: ${rem(16)};
 `;
 
 const Progress = styled.div`
   align-items: flex-end;
   display: flex;
   justify-content: flex-end;
+  height: 100%;
 `;
 
 const PlayHead = styled.span`