1、calc函数：
2、过渡
例子
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>过渡exercise</title><style>div {width: 300px;height: 300px;background-color: aqua;transition: all 0.5s ease;}div:hover {margin-left: 300px;margin-top: 300px;}</style>
</head><body><div></div>
</body></html>
