* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Pixelated MS Sans Serif', 'Arial', sans-serif;
}

body {
  background: #008080;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.calculator {
  position: absolute;
  top: 20px;
  left: 20px;
  background: #c0c0c0;
  border: 2px solid #000000;
  padding: 8px;
  user-select: none; /* Prevents text selection during drag */
}

.title-bar {
  cursor: move; /* Indicates the title bar is draggable */
  background: #000080;
  color: white;
  padding: 4px;
  font-size: 12px;
}

.screen {
  background: #fff;
  border: 2px solid #000;
  color: #000;
  padding: 2px;
  font-size: 16px;
  width: 160px;
  height: 20px;
  margin-bottom: 8px;
  text-align: right;
}

.button-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
}

.button {
  background: #c0c0c0;
  border: 2px outset #ffffff;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
}

.button:active {
  border-style: inset;
}