#particle {
  background-color: #442044;
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  left:0;
  z-index:0; 
}
#overlay {
}

.content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}

.box {
  -moz-border-radius:30px;
  -webkit-border-radius:30px;
  border-radius:30px;
  border: #solid 10px #000;
  background-color: rgba(105,100,100,0.8);
  width:100%;
  margin-left: auto ;
  margin-right: auto ;
  padding: 30px;
}