Somehow TailwindCSS does interfear with the isso CSS.

Around the up/down voting icons and the spacer separating them TailwindCSS added linebreaks. I had to add following lines to style.css

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  /* Target the footer container */
  .isso-comment-footer {
    display: flex; /* Use flexbox */
    align-items: center; /* Vertically center items */
    gap: 0.5rem; /* Add spacing between items */
  }

  /* Ensure SVG icons are aligned properly */
  .isso-upvote svg,
  .isso-downvote svg {
    display: inline-block;
    vertical-align: middle; /* Align icons with text */
  }

  /* Optional: Style the spacer */
  .isso-spacer {
    margin: 0 0.25rem; /* Add spacing around the spacer */
  }

TailwindCSS issues