html, body {
  height: 100%;
  margin: 0;
}
body {
  background: #000;
  color: #33ff33;
  font-family: "Courier New", Courier, monospace;
  text-shadow: 0 0 5px #33ff33;
}
#terminal {
  box-sizing: border-box;
  padding: 1rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}
#output {
  flex: 1;
  overflow-y: auto;
  white-space: pre-wrap;
}
.input-line {
  display: flex;
}
.prompt {
  margin-right: 0.5rem;
}
#command {
  background: transparent;
  border: none;
  color: #33ff33;
  flex: 1;
  font: inherit;
  outline: none;
}
body::after {
  content: "";
  pointer-events: none;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.15) 0,
    rgba(0, 0, 0, 0.15) 1px,
    transparent 1px,
    transparent 2px
  );
  z-index: 9999;
}