.pcontact-form
{
 display:none; 
}
.pcontact-form.poup {
    display: block;
}

.pcontact-form {
  position:absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-content: center;
  justify-content: center;
}
.pcontact-form {
  position: fixed;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(94, 110, 141, 0.9);
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 0.3s 0s, visibility 0s 0.3s;
  -moz-transition: opacity 0.3s 0s, visibility 0s 0.3s;
  transition: opacity 0.3s 0s, visibility 0s 0.3s;
  overflow-y: auto;
  z-index: 10000;
}

.pcontact-form.poup {
  opacity: 1;
  visibility: visible;
  -webkit-transition: opacity 0.3s 0s, visibility 0s 0s;
  -moz-transition: opacity 0.3s 0s, visibility 0s 0s;
  transition: opacity 0.3s 0s, visibility 0s 0s;
}
.pcontact-form .form-container {
    background-color: #2d3638;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    position:relative;
  padding: 40px;
  color: #fff;
}