#matrix-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  background: #000000;
}

.is-selected {
  outline: 2px solid #00ff78;
  outline-offset: 4px;
  border-radius: 2em;
}