h1 {
  text-align: center;
  color: red;
  font-weight: bold;
  font-size: 7em;
  margin-top: 100px;
}
h3 {
  text-align: center;
  color: teal;
  font-weight: bold;
  font-size: 3em;
  margin-top: 100px;
}
h4 {
  text-align: center;
  color: red;
  font-weight: bold;
  font-size: 2em;
  margin-top: 100px;
}
.essais {
  font-size: 12px;
  float: right;
}
form {
  height: 250px;
  background-color: rgba(0, 0, 0, 0.5);
  margin-top: 100px;
  margin-right: auto;
  margin-left: auto;
  padding: 20px;
}
legend {
  color: aqua;
}
label {
  float: left;
  color: aqua;
}
input {
  float: right;
}

@media (max-width: 1200px) {
  h1 {
    font-size: 5em;
  }
}
@media (max-width: 992px) {
  h1 {
    font-size: 4em;
    margin-top: 70px;
  }
  h3 {
    font-size: 1.5em;
    margin-top: 70px;
  }
  h4 {
    font-size: 1.3em;
    margin-top: 70px;
  }
}
@media (max-width: 767px) {
  h1 {
    font-size: 2em;
    margin-top: 30px;
  }
  h3 {
    font-size: 1.3em;
    margin-top: 30px;
  }
  h4 {
    font-size: 1.2em;
    margin-top: 30px;
  }
  form {
    margin-top: 30px;
  }
  #mdp {
    margin-bottom: 10px;
  }
}