urbit/pkg/interface/src/views/apps/term/css/custom.css

input#term {
  background-color: inherit;
  color: inherit;
}

.blink {
  animation: 4s ease-in-out infinite opacity_blink;
}

@keyframes opacity_blink {
  0%   { opacity: 0; }
  10%  { opacity: 1; }
  80%  { opacity: 1; }
  90%  { opacity: 0; }
  100% { opacity: 0; }
}