.box {
  border: 2px solid black;
  padding: 20px;
  background-color: LightGrey;
  color: black;
  text-align: center;
  font-family: Montserrat;
  width: 900px;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -90%);
  border-radius: 15px;
}
body{
  background-color: #afddf3;
}
div{
  padding: 15px;
  font-family: Montserrat;
}
input{
  padding: 5px;
  border: 1px solid black;
  border-radius: 10px;
}
.myinput{
  width: 830px;
}
.subscribe-button{
  width: 200px;
  height: 50px;
  font-weight: bold;
}