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 {
  .btn {
    // remove transitions on the buttons in the history modal
    transition: none;
  }
  .modal-inner-container {
    min-width: 960px;
    min-height: 500px;
  }
  #revision-controls {
    float: left;
    .btn[disabled] {
      cursor: not-allowed;
      background-color: dark-light-diff($primary, $secondary, 90%, -60%);
    }
    .btn-danger[disabled] {
      background-color: dark-light-diff($danger, $secondary, 30%, -60%);
    }
  }
  #display-modes {
    text-align: right;
  }
  #revision-details {
    padding: 5px;
    margin-top: 10px;
    border-bottom: 3px solid dark-light-diff($primary, $secondary, 90%, -60%);
  }
  #revisions {
    word-wrap: break-word;
    table {
      margin-top: 10px;
    }
  }
  img {
    max-width: 670px;
    height: auto;
  }
  .inline-diff {
    width: 670px;
  }
  .markdown {
    font-family: monospace;
    font-size: 0.857em;
    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;
    }
  }
  .span8, .markdown {
    img {
      max-width: 400px;
    }
  }
  .modal-header {
    height: 42px;
  }
}