/* 粒子背景 */
#particles-js {
  width: 100%;
  height: calc(100vh);
  background-color: #000000;
  background-image: url('');
  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
  overflow: hidden;
}

.particles-js-canvas-el {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9;
}