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HTML 

              
                <!DOCTYPE html>
<!--Codingthai.com--> 
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Movie App</title>
  </head>
  <body>
    <header>
      <form id="form">
        <input type="text" id="search" class="search" placeholder="Search">
      </form>
    </header>

    <main id="main"></main>

    <script src="script.js"></script>
  </body>
</html>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;400&display=swap');

:root {
  --primary-color: #22254b;
  --secondary-color: #373b69;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--primary-color);
  font-family: 'Poppins', sans-serif;
  margin: 0;
}

header {
  padding: 1rem;
  display: flex;
  justify-content: flex-end;
  background-color: var(--secondary-color);
}

.search {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  border-radius: 50px;
  font-family: inherit;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  color: #fff;
}

.search::placeholder {
  color: #7378c5;
}

.search:focus {
  outline: none;
  background-color: var(--primary-color);
}

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.movie {
  width: 300px;
  margin: 1rem;
  background-color: var(--secondary-color);
  box-shadow: 0 4px 5px rgba(0, 0, 0, 0.2);
  position: relative;
  overflow: hidden;
  border-radius: 3px;
}

.movie img {
  width: 100%;
}

.movie-info {
  color: #eee;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap:0.2rem;
  padding: 0.5rem 1rem 1rem;
  letter-spacing: 0.5px;
}

.movie-info h3 {
  margin-top: 0;
}

.movie-info span {
  background-color: var(--primary-color);
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  font-weight: bold;
}

.movie-info span.green {
  color: lightgreen;
}

.movie-info span.orange {
  color: orange;
}

.movie-info span.red {
  color: red;
}

.overview {
  background-color: #fff;
  padding: 2rem;
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  max-height: 100%;
  transform: translateY(101%);
  overflow-y: auto;
  transition: transform 0.3s ease-in;
}

.movie:hover .overview {
  transform: translateY(0);
}
!

JS 

              
                const API_URL = 'https://api.themoviedb.org/3/discover/movie?sort_by=popularity.desc&api_key=3fd2be6f0c70a2a598f084ddfb75487c&page=1'
const IMG_PATH = 'https://image.tmdb.org/t/p/w1280'
const SEARCH_API = 'https://api.themoviedb.org/3/search/movie?api_key=3fd2be6f0c70a2a598f084ddfb75487c&query="'

const main = document.getElementById('main')
const form = document.getElementById('form')
const search = document.getElementById('search')

// Get initial movies
getMovies(API_URL)

async function getMovies(url) {
    const res = await fetch(url)
    const data = await res.json()

    showMovies(data.results)
}

function showMovies(movies) {
    main.innerHTML = ''

    movies.forEach((movie) => {
        const { title, poster_path, vote_average, overview } = movie

        const movieEl = document.createElement('div')
        movieEl.classList.add('movie')

        movieEl.innerHTML = `
            <img src="${IMG_PATH + poster_path}" alt="${title}">
            <div class="movie-info">
          <h3>${title}</h3>
          <span class="${getClassByRate(vote_average)}">${vote_average}</span>
            </div>
            <div class="overview">
          <h3>Overview</h3>
          ${overview}
        </div>
        `
        main.appendChild(movieEl)
    })
}

function getClassByRate(vote) {
    if(vote >= 8) {
        return 'green'
    } else if(vote >= 5) {
        return 'orange'
    } else {
        return 'red'
    }
}

form.addEventListener('submit', (e) => {
    e.preventDefault()

    const searchTerm = search.value

    if(searchTerm && searchTerm !== '') {
        getMovies(SEARCH_API + searchTerm)

        search.value = ''
    } else {
        window.location.reload()
    }
})
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