h1{
  margin: 0;
  font-family: verdana;
  text-align: center;
  }

body{
  margin: 0;
  font-family: verdana;
  text-align: center;
  }
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

  background: url("mar.jpg") no-repeat center center/cover;
  
  filter: blur(2px) brightness(80%);
  z-index: -1;
}