body {
  margin: 0;
  height: 100vh;
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

.calculator {
  width: 280px;
  background: #000;
  padding: 20px;
  border-radius: 30px;
}

.top {
  margin-bottom: 20px;
}

.history {
  height: 20px;
  font-size: 14px;
  color: #888;
  text-align: right;
  overflow: hidden;
}

#display {
  width: 100%;
  height: 60px;
  font-size: 36px;
  text-align: right;
  border: none;
  background: transparent;
  color: white;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

button {
  height: 60px;
  border: none;
  border-radius: 50%;
  font-size: 22px;
  cursor: pointer;
}

button:active {
  filter: brightness(1.2);
}

button:not(.op):not(.util) {
  background: #1c1c1c;
  color: white;
}

.op {
  background: #ff9f0a;
  color: white;
}

.util {
  background: #a5a5a5;
  color: black;
}

.zero {
  grid-column: span 2;
  border-radius: 30px;
  text-align: left;
  padding-left: 24px;
}