I suggest putting the height="1.8em" into the .scenebreak CSS, removing it entirely from the .scn_img CSS, and adding a height:100% attribute to the img tag.
If you want to add space above and below the graphic, add some margin-top and margin-bottom to the .scenebreak CSS.
(The img tag height attribute only takes pixels or percent. Although the CSS height can take ems, I don't think it's specified what happens if you specify only height or width. But with the img height attribute, it's pretty much universal that the aspect ratio is maintained.)
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