Adding a style="max-width: 100%;" parameter to each image code would be the local solution.
The alternative would be to add custom styling to apply this for all sidebar images: .sidey img { max-width: 100%; }
Custom styling can be placed in either Parabola’s own Custom CSS field (in the settings) or in WordPress’ new Additional CSS field (in the customizer).
.sidey p { margin-bottom: 1em; }
should add the extra space (adjust the value as necessary).