.triangle-up {
  display: flex;
  position: fixed;
  width: 0;
  top: -2.5%;
  left: -2.5%;
  height: 0;
  border-left: 100px solid transparent;
  border-right: 100px solid transparent;
  border-bottom: 100px solid black; /* The colored side forms the base */
}
h1{
  position: fixed;
  top: 40%;
  left: 40%;
  color: white;
  z-index: 300000000000000000000000;
}
body {
  background-color: rgb(40,40,40);
}
#h2{
  position: fixed;
  top: 50%;
  left: 49%;
  color: white;
  z-index: 300000000000000000000000;
}
#h3{
  position: fixed;
  top: 60%;
  left: 49%;
  color: white;
  z-index: 300000000000000000000000;
}