.particles_container{
    position: relative;
    width: 100%;
    min-height: 100dvh;
    background-color:black;
  }
  .section1{
    width: 100%;
    height: 200dvh;
    background-color: green;
  }
  
  #particle_canvas {
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    position: absolute;
  }
  .header {
    position: sticky;
    top: 0;
    background-color: transparent;
    transition: background-color 0.3s;
  }
  
  .header.scrolled {
    background-color: black;
  }