discourse/app/assets/stylesheets/desktop/history.scss

// styles that apply to the popup that appears when you show the edit history of a post

.modal.history-modal {
  .modal-inner-container {
    max-width: var(--d-max-width);
  }
  .modal-body {
    height: 70vh;
  }
  #revision-controls {
    .btn[disabled] {
      cursor: not-allowed;
      background-color: var(--primary-low);
    }
    .btn-danger[disabled] {
      background-color: var(--danger-medium);
    }
  }

  #revision {
    display: flex;
    justify-content: space-between;
    padding-bottom: 0.5em;
  }

  #revisions {
    word-wrap: break-word;
    table {
      margin-top: 10px;
    }
  }
  #display-modes {
    .nav {
      margin: 0;
      padding: 0;
      border: none;
    }
  }

  img {
    max-width: 670px;
    height: auto;
  }
  .inline-diff {
    width: 670px;
  }
  .markdown {
    font-family: monospace;
    font-size: $font-down-1;
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
    td {
      width: 50%;
      vertical-align: top;
      max-width: 440px;
      word-wrap: break-word;
      white-space: pre-wrap;
    }
  }
  .revision-content,
  .markdown {
    img {
      max-width: 100%;
      box-sizing: border-box;
    }
  }
  .modal-header {
    height: 42px;
  }

  .modal-footer {
    display: flex;
    justify-content: space-between;
  }
}