.newsletter {
  position: fixed;
  display: inline-block;
  top: -100px;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: 600px;
  box-sizing: border-box;
  z-index: 9999;
  transition: top 1s ease;
  background-color: #ffffff;
  text-align: center;
  padding: 10px 5px;
  border: 1px solid #bfbfbf;
}
.newsletter h1 {
  position: relative;
  display: inline-block;
  font-family: sans-serif;
  font-weight: bold;
  font-size: 32px;
  color: #646464;
  margin: 20px;
  width: 100%;
  text-align: center;
}
.newsletter .input-email {
  position: relative;
  display: inline-block;
  color: #8ec640;
  background-color: transparent;
  border: 1px solid #bbbbbb;
  border-radius: 5px;
  padding: 10px;
  font-family: sans-serif;
  font-weight: 100;
  font-size: 16px;
}
.newsletter .input-submit {
  position: relative;
  display: inline-block;
  color: #ffffff;
  background-color: #8ec640;
  padding: 10px;
  width: 100%;
  max-width: 200px;
  text-align: center;
}
.newsletter input:focus,
.newsletter input:valid {
 box-shadow: none;
 outline: none;
 background-position: 0 0;
}
.newsletter.show {
  top: 50vh;
}