Отображение списка объектов слева направо в React

Я работаю над своим первым проектом React, проектом в рамках курса Udacity.

Задача (или эта ее часть) состоит в том, чтобы изначально визуализировать серию книжных объектов по горизонтали на трех полках.

Мне удалось визуализировать полки и книги внутри них, однако книги на каждой полке отображаются сверху вниз, а не слева направо.

Одно из опубликованных мной решений - использовать display: inline; в файле CSS, но я сделал это безуспешно.

Как исправить код, чтобы книги на полках отображались горизонтально?

Я включил файлы ListBooks.js и App.css. Сообщите мне, если мне нужно будет добавить что-нибудь еще.

ListBooks.js

import React, { Component } from 'react';
import PropTypes from 'prop-types'
import './App.css'

const shelves = [
  {
    key: 'currentlyReading',
    name: 'Currently Reading'
  },
  {
    key: 'wantToRead',
    name: 'Want To Read'
  },
  {
    key: 'read',
    name: 'Read'
  }
];

class ListBooks extends Component {

    static propTypes = {
       books: PropTypes.array.isRequired
    }

    state = {
        showSearchPage: false,
        query: ''
      }

    render() {

        const { books } = this.props

        function getBooksForShelf(shelfKey) {
          return books.filter(book => book.shelf === shelfKey);
        }

        return(
            <div className = "app">
            {this.state.showSearchPage ? (
              <div className = "search-books">
                <div className = "search-books-bar">
                  <a className = "close-search" onClick = {() => this.setState({ showSearchPage: false })}>Close</a>
                  <div className = "search-books-input-wrapper">
                    {/*
                      NOTES: The search from BooksAPI is limited to a particular set of search terms.
                      You can find these search terms here:
                      https://github.com/udacity/reactnd-project-myreads-starter/blob/master/SEARCH_TERMS.md
                      However, remember that the BooksAPI.search method DOES search by title or author. So, don't worry if
                      you don't find a specific author or title. Every search is limited by search terms.
                    */}
                    <input type = "text" placeholder = "Search by title or author"/>
                  </div>
                </div>
                <div className = "search-books-results">
                  <ol className = "books-grid"></ol>
                </div>
              </div>
            ) : (
              <div className = "list-books">
                <div className = "list-books-title">
                  <h1>My Reads</h1>
                </div>
                <div className = "list-books-content">
                  <div>
                    { shelves.map((shelf) => (
                      <div key = {shelf.key} className = "bookshelf">
                        <h2 className = "bookshelf-title">{shelf.name}</h2>
                          <div className = "bookshelf-books">
                            <ol className = "books-grid">
                        <li>
                          { getBooksForShelf(shelf.key).map((book) => (
                            <div key = {book.id} className = "book">
                              <div className = "book-top">
                               <div className = "book-cover" style = {{ width: 128, height: 193, backgroundImage: `url(${book.imageLinks.thumbnail})` }}></div>
                                <div className = "book-shelf-changer"> 
                                 <select>
                                  <option value = "none" disabled>Move to...</option>
                                    <option value = "currentlyReading">Currently Reading</option>
                                    <option value = "wantToRead">Want to Read</option>
                                    <option value = "read">Read</option>
                                    <option value = "none">None</option>
                                   </select>
                                </div>
                              </div>
                              <div className = "book-title">{book.title}</div>
                             <div className = "book-authors">{book.author}</div>
                            </div>
                            ))}
                          </li>
                        </ol>
                        </div> 
                      </div>
                    )) }
                  </div>
                </div>
                <div className = "open-search">
                  <a onClick = {() => this.setState({ showSearchPage: true })}>Add a book</a>
                </div>
              </div>
            )}
          </div>
        )
    }
}

export default ListBooks

App.css

html, body, .root {
  height: 100%;
}
body {
  line-height: 1.5;
}
body, .app {
  background: white;
}

/* main page */

.list-books-title {
  padding: 10px 0;
  background: #2e7c31;
  text-align: center;
}
.list-books-title h1 {
  font-weight: 400;
  margin: 0;
  color: white;
}

.list-books-content {
  padding: 0 0 80px;
  flex: 1;
}

.bookshelf {
  padding: 0 10px 20px;
}

@media (min-width: 600px) {
  .bookshelf {
    padding: 0 20px 40px;
  }

}

.bookshelf-title {
  border-bottom: 1px solid #dedede;
}
.bookshelf-books {
  text-align: center;
}

.open-search {
  position: fixed;
  right: 25px;
  bottom: 25px;
}
.open-search a {
  display: block;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #2e7d32;
  background-image: url('./icons/add.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: 28px;
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  font-size: 0;
}

/* search page */

.search-books-bar {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 5;
  display: flex;
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 0 6px rgba(0,0,0,0.23);
}
.search-books-input-wrapper {
  flex: 1;
  background: #e9e;
}
.search-books-bar input {
  width: 100%;
  padding: 15px 10px;
  font-size: 1.25em;
  border: none;
  outline: none;
}

.close-search {
  display: block;
  top: 20px;
  left: 15px;
  width: 50px;
  height: 53px;
  background: white;
  background-image: url('./icons/arrow-back.svg');
  background-position: center;
  background-repeat: no-repeat;
  background-size: 28px;
  font-size: 0;
}

.search-books-results {
  padding: 80px 10px 20px;
}

/* books grid */

.books-grid {
  list-style-type: none;
  padding: 0;
  margin: 0;

  display: inline;
  justify-content: center;
  flex-wrap: wrap;
}
.books-grid li {
  padding: 10px 15px;
  text-align: left;
}

.book {
  width: 140px;
}
.book-title,
.book-authors {
  font-size: 0.8em;
}
.book-title {
  margin-top: 10px;
}
.book-authors {
  color: #999;
}

.book-top {
  position: relative;
  height: 200px;
  display: flex;
  align-items: flex-end;
}

.book-shelf-changer {
  position: absolute;
  right: 0;
  bottom: -10px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #60ac5d;
  background-image: url('./icons/arrow-drop-down.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: 20px;
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}
.book-shelf-changer select {
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* book cover */

.book-cover {
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  background: #eee;
}
.book-cover-title {
  padding: 20px 10px 0;
  text-align: center;
  font-size: 0.8em;
}