29.CSS边框动画特效

效果

源码

index.html

	

		
		
01
	

css

@import url('https://fonts.googleapis.com/css?family=Poppins:100,200,300,400,500,600,700,800,900');
*
{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: 'Poppins', sans-serif;
}
body
{
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	background: #0c1022;
}
.box
{
	position: relativ