html,
body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#particle-canvas {
  width: 100%;
  height: 100%;
}
#particle-canvas:before  {
  -webkit-filter: blur(4px);
  -moz-filter: blur(4px);
  -o-filter: blur(4px);
  -ms-filter: blur(4px);
  filter: blur(4px);
}
 #overlay {
        align-items: center;
        display: flex;
        flex-direction: column;
        justify-content: center;
        text-align: center;
        bottom: 50%;
        color: #fff;
        left: 50%;
        position: absolute;
        right: 50%;
        top: 50%;
        z-index: 100;
      }

 #overlay h1 {
        font-size: 64px;
        font-weight: 100;
        display: block;
        margin: 0;
      }