body {
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100%;
  background-image: url('image/mao.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  font-family: 'proxima-nova', sans-serif;
  color: white;}

h1, h2 {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 20px;}


.back {
  position: fixed;
  left: 20px;
  bottom: 60px;
  font-size: 30px;
  font-family: sans-serif;
  color: white;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 2px;
  transition: all 0.3s ease;
  z-index: 10;
}