a calculator using js
/位置/
position: absolute; top: 6px; left: 6px; bottom: 10px; right: 12px; width: 10rem; height: 20rem; min-width: 3rem; /布局/ display: flex; flex-direction: column; /修饰 - 整体/ background: box-shadow: /修饰 - 字体/ color: font-size: text-transform: /修饰 - 边框/ border: border-radius:
/修饰 - 特性/