#calc-app button {
  box-sizing: border-box;
  cursor: pointer;
  min-width: auto;
  min-height: auto;
  padding: 0;
  box-shadow: none;
  text-shadow: none;
  color: #000;
}

#calc-app {
  font-family: "MS Sans Serif", Arial, sans-serif;
  user-select: none;
}

#calc-app #calc { width: 220px; }

#calc-app #display {
  width: 100%;
  text-align: right;
  font-size: 16px;
  font-family: monospace;
  padding: 4px 6px;
  margin-bottom: 6px;
  background: #fff;
  border: 2px inset #808080;
  height: 28px;
  overflow: hidden;
}

#calc-app .row {
  display: flex;
  gap: 2px;
  margin-bottom: 2px;
}

#calc-app button {
  flex: 1;
  height: 28px;
  font-size: 12px;
  font-family: inherit;
  border: 2px outset #fff;
  background: #c0c0c0;
  cursor: pointer;
}

#calc-app button:active { border-style: inset; }

#calc-app .op {
  background: #d4d0c8;
  font-weight: bold;
}

#calc-app .wide { flex: 2.05; }

#calc-app #display-mem {
  font-size: 10px;
  height: 14px;
  color: #444;
  margin-bottom: 2px;
}