html, body { height: 100%; margin: 0; }
body { font-family: sans-serif; background-image: radial-gradient(circle, #051732, #11192e, #181b29, #1d1d25, #202021);} 
#particles-js { position: fixed; inset: 0; z-index: 0; }
.center-box {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(36, 41, 63);
  padding: 2rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
.center-box img {
  width: 64px;
  height: 64px;
  filter: invert(1);
  transition: transform 0.3s ease;
}
.center-box img:hover {
  transform: scale(1.15);
}