Ali Abdaal 1.0.1 introduced wide and full-width images in posts and pages.

To add this to version 1.0.0, add the following to your Code Injection head:

<style>
.kg-image-card img {
  height: auto;
  width: 100%;
}

.kg-width-wide,
.kg-width-full {
  position: relative;
  width: 75vw;
  min-width: 100%;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  transform: translateX(calc(50vw - 50%));
}
.kg-width-full {
  width: 100vw;
}
</style>