*{
  margin: 0;
  padding: 0;
  border: 0;
  
}

html, body {
  width: 100%;
  height: 100%;
  
}

body {
  background: #000010;
  height: 100vh;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  font-size: var(--font-size-normal);
}

#particles {
  width: 100%;
  height: 100%;
}



@media only screen and (max-width: 1000px) {
  h1 {
    font-size: 15px;
  }
}

@media only screen and (max-width: 100px) {
  h1 {
    font-size: 15px;
  }
  h1::after {
    height: 8px;
  }
}

@media only screen and (max-width: 100px) {
  #intro {
    padding: 0 10px;
  }
  h1 {
    font-size: 15px;
  }
  h1::after {
    height: 6px;
  }
  p {
    font-size: 18px;
  }
  .btn {
    font-size: 16px;
  }
}

@media only screen and (max-width: 100px) {
  h1 {
    font-size: 15px;
  }
  h1::after {
    height: 4px;
  }
}