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;
}
.banque
{
  margin: 50px 0 20px;
  text-align: center;
  font-size: 60px;
  color: #000;
}
.medsocfb
{
  margin: 50px 0 20px;
  text-align: center;
  font-size: 60px;
  color: #000;
}
.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: 800px) {
  .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%;
  }
}