console 命令行工具 X clear

console

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Document</title>
</head>
<body>
  <div class="div1">我是div1  a dda </div>
</body>
</html>

.div1{ width: 150px; height:150px; text-align: center;
  background: lightblue; transition: all 2s ; 
  margin:50px; animation: myf 3s 4s 1 alternate ;}
.div1:hover {
    xtransform: rotateY(360deg); 
}

@keyframes myf{
  50% {transform: rotateY(360deg) scale(0.7); opacity: 0.3}
  100% {transform: rotateY(0deg) scale(1); }
}