body {
  /*background: linear-gradient(rgba(10,10,10,0.8), rgba(10,10,10,0.7)),  url('../images/back.jpg');*/
  background: linear-gradient(rgba(10,10,10,0.8), rgba(10,10,10,0.7)),  url('../images/back.jpg');
  /*background: linear-gradient(red, blue);*/
  background-position: fixed;
  background-repeat: no-repeat;
  background-size: cover;
  color: white;
}
div .para {
  padding-top: 15px;
  padding-bottom: 15px;
  background-color: rgba(150,150,255,0.4);
  border-radius: 15px;
  margin-top: 50px;
  height: 540px;
}
div .content {
  border: 2px solid rgba(1,1,1,0.3);
  border-radius: 10px;
  height: 100%;
}

hr {
  border: 0.5px solid gray;
}
.rules {
  min-height: 60%;
  background-color: rgba(200,200,240,0.3);
}