Formulario de contacto con CSS

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HTML

CSS

@import "https://fonts.googleapis.com/css?family=Poppins";
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  background: #333;
  font-family: Poppins;
  text-transform: uppercase;
  font-size: 11px;
  background: #0f0c29; /* fallback for old browsers */
  background: -webkit-linear-gradient(
    to right,
    #24243e,
    #302b63,
    #0f0c29
  ); /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(
    to right,
    #24243e,
    #302b63,
    #0f0c29
  ); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
h1 {
  margin: 0;
}
#contact {
  margin: 4em auto;
  width: 100px;
  height: 30px;
  line-height: 30px;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  border: 1px solid white;
}

#contact:hover {
  background: #000000;
}
#contact:active {
  background: #444;
}

#contactForm {
  display: none;

border: 6px solid 3324be;
  padding: 2em;
  width: 400px;
  text-align: center;
  background: #fff;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  border-radius: 16px;
}

input,
textarea {
  outline: 0;
  background: #f2f2f2;
  width: 100%;
  border: 0;
  margin: 0 0 15px;
  padding: 15px;
  box-sizing: border-box;
  font-size: 14px;
  border-radius: 15px;
}
textarea {
  height: 80px;
  resize: none;
}

.formBtn {
  outline: 0;
  background: #3324be;
  width: 140px;
  height: 30px;
  border: 0;
  color: #ffffff;
  font-size: 1.2em;
  border-radius: 15px;
  -webkit-transition: all 0.3 ease;
  transition: all 0.3 ease;
  cursor: pointer;
}