Logos are 420x140px and transparent PNG format.

https://www.solid-run.com/brand-guidelines/
    SolidRun-with-under-line-small-01.png -- original
    SolidRun-with-under-line-small-01-resize-crop.png -- cropped

https://gw4.ac.uk/
    GW4-logo_RGB.svg -- original
    GW4-logo_RGB.png -- cropped to 140px height (https://ezgif.com/svg-to-png)
    GW4-logo_RGB-resize-crop.png -- padded to 420px width

https://github.com/osuosl
    OSUOSL.png -- original
    OSUOSL-crop-transparent.png -- cropped to 420x140px (no resize needed) and white background removed

https://www.ionfish.org/
    ionFish_fullcolor.png -- original
    ionFish_fullcolor-resize-crop.png -- cropped