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

.modal.history-modal {
  button {
    float: none;
  }
  #display-modes {
    display: none;
  }
  #revision-numbers {
    line-height: $line-height-large;
  }
  #revision-details {
    background-color: $primary-low; 
    padding: 5px;
    margin-top: 10px;
  }
  img {
    max-width: 95%;
    height: auto;
  }
}