body{ 
  margin:0; 
} 
#particles-js{ 
  position:absolute; 
  width: 100%; 
  height: 100%; 
  background-color: #013E8E; 
  background-image: url("../../assets/images/kantor-walikotadumai.jpg"); 
  background-repeat: no-repeat;
  filter: grayscale(50%); 
  background-size: cover; 
  background-position: 50% 50%; 
}