style.css

* {
  margin: 0;
  padding: 0;
}
body {
  background: url(bg.jpg) no-repeat center center fixed;
  background-size: cover;
}
.container {
  color: white;
  position: absolute;
  top: 20%;
  left: 55%;
}
.container h1 {
  display: inline-block;
  font-size: 45px;
  border-bottom: 5px solid white;
  margin-bottom: 33px;
  padding: 13px 0;
}
.box {
  width: 100%;
  border-bottom: 2px solid white;
  margin: 13px 0px;
}
.box input {
  background: none;
  width: 75%;
  padding: 5px 10px;
  border: none;
  outline: none;
  color: white;
  font-size: 20px;
}
.btn {
  cursor: pointer;
  outline: none;
  width: 25%;
  margin: 12px 0px;
  padding: 6px;
  border: 2px solid white;
  border-radius: 10px;
  font-size: 18px;
  background: none;
  color: white;
}
.box i{
  width: 25px;
  text-align: center;
}