body {
  background-image: url(../images/jlc_1.png),
                    linear-gradient(to right,  rgb(181,180,176), rgb(222,222,222));
  width: 100%;
  height: 1060px;
  background-position: center top;
  background-repeat: no-repeat;
}
.err {
  margin-top: 260px;
}
form {
  margin-top: 280px;
}
.erreur {
  margin-top: 70px;
}

@media (max-width: 1200px) {
  body {
    position: relative;
    overflow-x: hidden;
    min-height: 1200px;
  }
}
@media (max-width: 992px) {
  body {
    min-height: 992px;
  }
form {
  margin-top: 340px;
}
}
@media (max-width: 767px) {
  body {
    background-size: 100% auto;
    position: relative;
    overflow-x: hidden;
    height: 767px;
  }
form {
  margin-top: 250px;
}
}