Settings panel does not appear on mobile Safari

[hoffstein]

Hi, the settings panel does not seem to appear when loading Spectrogram on mobile Safari. This may be a known issue, but since I saw this commit (https://github.com/calebj0seph/spectro/commit/a6805b7ed39b533b7d50404a5e5dc44504479ee0), I wanted to check if it's not working as intended.

Thank you for the great project, Ben