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

.modal.history-modal {
  button {
    float: none;
  }
  .modal-body {
    height: 62vh;
  }
  .modal-inner-container {
    min-height: 400px;
  }
  #revisions {
    max-width: 90vw;
  }
  #revision-numbers {
    line-height: $line-height-large;
  }
  img {
    max-width: 95%;
    height: auto;
  }
  .revision-content {
    table {
      table-layout: fixed;
      width: 100%;
      word-wrap: break-word;
    }
  }

  .modal-footer {
    text-align: center;
  }

  #revision-controls {
    margin-bottom: 5px;
  }

  #revision-footer-buttons {
    button {
      @extend .btn-small;
    }
  }
}