body {
  text-align: center;
}
form{
  border-bottom: 2px solid black;
  position: absolute;
  top: 45%;
  left: 50%;
  margin-left: -100px;
  }
input{
  width: 200px;
}
.my-button{
	background-color: #800080;
color: white;
  display: inline-block;
  margin-top: 15px;
}
.my-button:hover{
  display: inline-block;
  margin-top: 15px;
}
input:not(:first-child){
  display: block;
  margin-top: 15px;
}