SJRK icon get hidden when when the text size is reduced

SJRK image(at the top left corner) is not reducing when text size is reduced from the preferences. Originally reported by GitHub user Chaitanyassr in the repository's Issues list: #63

To reproduce:

1. Go to https://stories.sojustrepairit.org/
2. Click "show preferences" to open the UIO panel
3. Reduce the Text Size option by clicking the minus button

Expected:

The text and all graphics will be reduced in size and in proportion with each other

Actual:

The site logo in the masthead remains the same size regardless of text size (see the attached screenshot: 78667191-20744480-78f6-11ea-85fc-698107adcf00.png)