style.css

body {
  font-size: 100%;
  padding-bottom: 30px;
  font-family: 'Questrial', sans-serif;
  background-color: #e5dcdc;
}
main {
  width: 80%;
  margin: auto;
}

header, .container {
  margin-top: 15px;
  margin-bottom: 15px;
  padding-top: 20px;
  padding-bottom: 20px;
  padding-left: 10px;
  text-align: center;
  color: white;
  border-radius: 6px;
  box-shadow: 9px 9px 20px black;
  background: #43C6AC;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to top, #191654, #43C6AC);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to top, #191654, #43C6AC); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
header:hover, div:hover{
  box-shadow: 0 0 0;
}
h3 {
  color: white;
}
ul li {
  list-style-type: none;
  display: inline-block;
  margin-right: 20px;
  margin-left: 20px;
}
a {
  text-decoration: none;
  color: white;
  opacity: 0.6;
}
a:hover {
  color: #ce3b74;
  opacity: 1.0;
}
.bouton-red a{
  display: block;
  width: 150px;
  height: 40px;
  margin: auto;
  background-color: #ed3d3d;
  line-height: 40px;
  border-radius: 5px;
  opacity: 1.0;
}
.img-circle {
  border-radius: 50%;
  width: 100px;
  height: 100px;
  border: solid 3px grey;
}
.film_affiche {
 width: 200px;
 height: auto;
}
.container img {
  border-radius: 5px;
  box-shadow: 3px 4px 5px black;
}
/*Media Queries */

@media (max-width: 960px) {
  /* For a screen < 960px, this CSS will be read */
  header, .container, .movie_card {
    width: 700px;
    margin: auto;
    margin-top: 10px;
    margin-bottom: 10px;
    padding-right: 10px;
    padding-left: 10px;
  }
}
@media (max-width: 720px) {
  /* For a screen < 720px, this CSS will be read */
  header, .container ,.movie_card {
    width: 500px;
    margin: auto;
    margin-top: 10px;
    margin-bottom: 10px;
    padding-right: 10px;
    padding-left: 10px;
    font-size: 90%;
  }
}
@media (max-width: 540px) {
  /* For a screen < 540px, this CSS will be read */
  header, .container ,.movie_card {
    width: 300px;
    margin: auto;
    margin-top: 10px;
    margin-bottom: 10px;
    padding-right: 10px;
    padding-left: 10px;
    font-size: 70%;
  }
  .container ul li a {
  font-size: 80%;
  }
  .movie_card img {
    width: 120px;
  }
}