body {
  background-color: #000;
  color: #00ff00;
  font-family: "Courier New", Courier, monospace;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  text-align: center;
  margin: 5vh 3vw 5vh 3vw;
}

a {
  color: #00ff00;
  text-decoration: none;
  display: block;
  margin: 10px 0;
}

a.disabled {
  pointer-events: none;
  color: #555555;
  text-decoration: line-through;
  cursor: not-allowed;
}

#showQrBtn,
#saveQrBtn,
.styled-btn {
  display: inline-block;
  font-family: "Courier New", Courier, monospace;
  color: #00ff00;
  background: #111;
  border: 1px solid #00ff00;
  border-radius: 4px;
  padding: 6px 18px;
  margin: 12px 0 0 0;
  cursor: pointer;
  transition:
    background 0.2s,
    color 0.2s;
}

#showQrBtn:hover,
#showQrBtn:focus,
#saveQrBtn:hover,
#saveQrBtn:focus,
.styled-btn:hover,
.styled-btn:focus {
  background: #00ff00;
  color: #111;
  outline: none;
}