* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
}

.calc-bg {
  background: #000000;
}

.calc-body {
  background: #000000;
  border: 1px solid #333333;
}

.display {
  background: #000000;
  border: 1px solid #333333;
}

.display-num {
  color: #333333;
  font-variant-numeric: tabular-nums;
}

.expr-text {
  color: #333333;
}

.calc-btn {
  background: #333333;
  color: #000000;
  border: 1px solid #333333;
}

.calc-btn:active {
  background: #000000;
  color: #333333;
}

.footer-link {
  color: #333333;
  text-decoration: underline;
  text-underline-offset: 4px;
}

button { cursor: pointer; font-family: 'JetBrains Mono', monospace; }
button:focus { outline: none; }