body {
    background: #fff;
    display: flex;
    flex-direction: column;
  }
  
  .titre-contact {
    margin: 50px 0 20px;
    text-align: center;
    font-size: 60px;
    color: #000;
  }
  .contact-sous-titre {
    font-weight: lighter;
    text-align: center;
    margin: 10px 0 70px;
  }
  .trois-contacts {
    width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
  }
  .box {
    width: 200px;
    text-align: center;
  }
  .box span {
    font-size: 20px;
  }
  .box img {
    display: block;
    margin: 0 auto 10px;
    width: 70px;
  }
  
  /* formulaire */
  
  form {
    width: 900px;
    margin: 100px auto 50px;
    box-shadow: 0 10px 15px 5px rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 5px;
  }
  form h2 {
    text-align: center;
    font-size: 40px;
    margin: 10px 0 20px;
  }
  .label-input {
    display: block;
    margin: 10px 0 10px 10px;
    font-size: 20px;
  }
  .label-input:nth-child(1) {
    margin-top: 20px;
  }
  
  input[type="text"],
  input[type="number"] {
    display: block;
    width: 90%;
    margin: 10px 10px 20px;
    padding: 12px;
    border-radius: 5px;
    font-size: 18px;
    border: 1px solid #000;
  }
  .titre-check {
    display: inline;
    font-size: 20px;
    padding: 0 10px;
  }
  .groupe-check {
    display: inline;
  }
  .labels-check {
    font-size: 18px;
  }
  input[type="checkbox"] {
    display: inline;
    border: none;
    margin-right: 20px;
    margin-left: 5px;
    border-radius: 2px;
  }
  label[for="txt"] {
    display: block;
    text-align: left;
    font-size: 22px;
    margin: 30px 10px 20px;
  }
  textarea {
    font-family: Open sans, Arial, Helvetica, sans-serif;
    display: block;
    width: 90%;
    height: 200px;
    margin: 10px 10px 20px;
    resize: none;
    font-size: 18px;
    padding: 18px;
    border: 1px solid #000;
  }
  form button {
    display: block;
    margin: 10px auto 20px;
    width: 200px;
    height: 40px;
    font-size: 20px;
    border: none;
    border: 1px solid #000;
    border-radius: 5px;
  }
  
  @media screen and (max-width: 950px) {
    .titre-contact {
      margin: 30px 0 20px;
      font-size: 40px;
    }
    .contact-sous-titre {
      margin: 0 20px 20px;
      font-size: 16px;
    }
    .trois-contacts {
      flex-direction: column;
      width: 90%;
      align-items: center;
      justify-content: space-between;
    }
    .box {
      margin: 20px 0;
    }
    .box img {
      width: 50px;
    }
    form {
      width: 90%;
      margin: 80px auto 50px;
    }
    form h2 {
      text-align: center;
      font-size: 30px;
      margin: 10px 0 30px;
    }
    .groupe-check {
      display: block;
      margin: 10px 0 10px 10px;
      font-size: 20px;
    }
    textarea {
      width: 80%;
    }
    input[type="text"],
    input[type="number"] {
      width: 80%;
    }
  }