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@numericcitizen Here is a simpler way to accomplish something similar. It's not exactly what you asked for, but it's easier and non-intrusive. Add the following to your custom CSS in micro.blog. Don't need to edit a custom theme.
.post-preview {
border-bottom: 1px dashed lightgray;
margin-bottom: 30px;
}
You'll need to play with the exact values to get whatever you want. You can use color variables as well (like in the rest of the theme).