@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in {
  animation: fadeIn 4s ease-in;
}

h1 {
  display: inline-block;
  max-width: 20%;
  animation: bouge 2s infinite alternate;
}

@keyframes bouge {
  0%   { transform: translateX(0); }
  100% { transform: translateX(50vw); }
}

body, html {
  margin: 10px;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

header, main, footer, section {
  width: 90%;
  margin: 10px auto;
  padding: 1rem;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  padding: 0;
}

nav li {
  margin: 0.5rem;
}

img, video {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 900px) {
  nav ul {
    flex-direction: column;
  }

  section {
    padding: 0.5rem;
  }

  h2 h3 h4 {
    font-size: 1.5rem;
  }
}

@media (max-width: 500px) {
  nav ul {
    flex-direction: column;
  }

  section {
    padding: 0.5rem;
  }

  h2, h3, h4 {
    font-size: 1rem;
  }
}

.competences li {
  width: 15%;}


  a {
  background-color: blue;
  color: white;
  padding: 0.5rem 1rem;
  transition: all 3s ease;
}

a:hover {
  background-color: white;
  color: blue;
}


body {
  background-color: #22406d;
  color: #e6edf3;
  font-family: Arial, sans-serif;
}

.photos-projet img,
.photos-projet video {
  margin: 2%;
}