<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Pure CSS corner ribbon</title>
<style type="text/css">
@import url(https://fonts.googleapis.com/css?family=Lato:700);
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: #f0f0f0;
}
.box {
position: relative;
max- 600px;
90%;
height: 400px;
background: #fff;
box-shadow: 0 0 15px rgba(0,0,0,.1);
}
/* common */
.ribbon {
150px;
height: 150px;
overflow: hidden;
position: absolute;
}
.ribbon::before,
.ribbon::after {
position: absolute;
z-index: -1;
content: '';
display: block;
border: 5px solid #2980b9;
}
.ribbon span {
position: absolute;
display: block;
225px;
padding: 15px 0;
background-color: #3498db;
box-shadow: 0 5px 10px rgba(0,0,0,.1);
color: #fff;
font: 700 18px/1 'Lato', sans-serif;
text-shadow: 0 1px 1px rgba(0,0,0,.2);
text-transform: uppercase;
text-align: center;
}
/* top left*/
.ribbon-top-left {
top: -10px;
left: -10px;
}
.ribbon-top-left::before,
.ribbon-top-left::after {
border-top-color: transparent;
border-left-color: transparent;
}
.ribbon-top-left::before {
top: 0;
right: 0;
}
.ribbon-top-left::after {
bottom: 0;
left: 0;
}
.ribbon-top-left span {
right: -25px;
top: 30px;
transform: rotate(-45deg);
}
/* top right*/
.ribbon-top-right {
top: -10px;
right: -10px;
}
.ribbon-top-right::before,
.ribbon-top-right::after {
border-top-color: transparent;
border-right-color: transparent;
}
.ribbon-top-right::before {
top: 0;
left: 0;
}
.ribbon-top-right::after {
bottom: 0;
right: 0;
}
.ribbon-top-right span {
left: -25px;
top: 30px;
transform: rotate(45deg);
}
/* bottom left*/
.ribbon-bottom-left {
bottom: -10px;
left: -10px;
}
.ribbon-bottom-left::before,
.ribbon-bottom-left::after {
border-bottom-color: transparent;
border-left-color: transparent;
}
.ribbon-bottom-left::before {
bottom: 0;
right: 0;
}
.ribbon-bottom-left::after {
top: 0;
left: 0;
}
.ribbon-bottom-left span {
right: -25px;
bottom: 30px;
transform: rotate(225deg);
}
/* bottom right*/
.ribbon-bottom-right {
bottom: -10px;
right: -10px;
}
.ribbon-bottom-right::before,
.ribbon-bottom-right::after {
border-bottom-color: transparent;
border-right-color: transparent;
}
.ribbon-bottom-right::before {
bottom: 0;
left: 0;
}
.ribbon-bottom-right::after {
top: 0;
right: 0;
}
.ribbon-bottom-right span {
left: -25px;
bottom: 30px;
transform: rotate(-225deg);
}
</style>
</head>
<body>
<div class="box">
<div class="ribbon ribbon-top-left"><span>ribbon</span></div>
<div class="ribbon ribbon-top-right"><span>ribbon</span></div>
<div class="ribbon ribbon-bottom-left"><span>ribbon</span></div>
<div class="ribbon ribbon-bottom-right"><span>ribbon</span></div>
</div>
</body>
</html>