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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>hover border</title>
<style>
body, html {
height: 100%;
width: 100%;
display: flex;
justify-content: center;
align-items: center;
margin: 0;
}
.block {
width: 300px;
height: 300px;
cursor: pointer;
background: #f5f5f5;
position: relative;
}
.hover-effect-border-red {
position: absolute;
left: -2px;
right: -2px;
top: -2px;
bottom: -2px;
z-index: -1;
overflow: hidden;
}
.hover-effect-border-red-left:after,
.hover-effect-border-red-right:after,
.hover-effect-border-red-left:before,
.hover-effect-border-red-right:before {
content: "";
left: 50%;
right: 50%;
height: 2px;
position: absolute;
top: 0;
background-color: #b41e32;
}
.hover-effect-border-red-left:before,
.hover-effect-border-red-right:before {
top: auto;
bottom: 0;
}
.hover-effect-border-red-left::before {
right: 100%;
left: auto;
width: 50%;
}
.hover-effect-border-red-right::before {
left: 100%;
right: auto;
width: 50%;
}
.block:hover .hover-effect-border-red-left::after,
.block:hover .hover-effect-border-red-right::after {
height: calc(100% - 2px);
transition: left 0.5s, right 0.5s, height 0.5s 0.5s;
}
.block:hover .hover-effect-border-red-left::after {
left: 0;
}
.block:hover .hover-effect-border-red-right::after {
right: 0;
}
.block:hover .hover-effect-border-red-left::before,
.block:hover .hover-effect-border-red-right::before {
bottom: 0;
transition: all 0.5s 1s;
}
.block:hover .hover-effect-border-red-left::before {
right: 50%;
}
.block:hover .hover-effect-border-red-right::before {
left: 50%;
}
</style>
</head>
<body>
<div class="block">
<div class="hover-effect-border-red">
<div class="hover-effect-border-red-left"></div>
<div class="hover-effect-border-red-right"></div>
</div>
</div>
</body>
</html>