html {
  height: 100%;
}

body {
  background: #000000;
  width: 100%;
  height: 100%;
  position: relative;
  -webkit-font-smoothing: antialiased;
  color: #fff;
  font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
  text-align: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
}

h1 {
  font-size: 39px;
  font-weight: bold;
  color: #fff;
}

button {
  position: relative;
  display: block;
  margin: 0 auto;
  width: 140px;
  height: 30px;
  border-radius: 30px;
  background: #fff;
  color: #000000;
  border: none;
  font-weight: bold;
  font-size: 12px;
  cursor: pointer;
  outline: none;
}

a {
  color: #fff;
  display: block;
  position: relative;
  font-size: 16px;
  text-decoration: none;
  font-weight: bold;
  top: 40px;
}

body,
button {
  -webkit-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}