body { 
    background: url('../img/bg14.jpg') no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
  }
.kontener {
    display: grid;
    place-items: center;
    min-height: 100vh;
  }