/*コンテンツを囲むラッパー要素*/
.cms_particles{
  position: absolute;
  width: 100%;
  height: 1120px;
}
.cms_particles::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 100px;
  background: linear-gradient(transparent 0, #FFFFFF 100%);
}
/*アニメーション描画用*/
.cms_particles canvas{
  position: absolute;
  top: 0;
  right: 0;
}