DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Documenttitle>
<style type="text/css">
/*向上*/
.triangle_border_up{
width:0;
height:0;
border-width:0 30px 30px;
border-style:solid;
border-color:transparent transparent #333;/*透明 透明 灰*/
margin:40px auto;
position:relative;
}
/*向下*/
.triangle_border_down{
width:0;
height:0;
border-width:30px 30px 0;
border-style:solid;
border-color:#333 transparent transparent;/*灰 透明 透明 */
margin:40px auto;
position:relative;
}
/*向左*/
.triangle_border_left{
width:0;
height:0;
border-width:30px 30px 30px 0;
border-style:solid;
border-color:transparent #333 transparent transparent;/*透明 灰 透明 透明 */
margin:40px auto;
position:relative;
}
/*向右*/
.triangle_border_right{
width:0;
height:0;
border-width:30px 0 30px 30px;
border-style:solid;
border-color:transparent transparent transparent #333;/*透明 透明 透明 灰*/
margin:40px auto;
position:relative;
}
.triangle{
width:0;
height:0;
border-width:30px 30px 30px 30px;
border-style:solid;
border-color:red blue green #333;/*透明 透明 透明 灰*/
margin:40px auto;
position:relative;
}
style>
head>
<body>
<div class="triangle">
div>
<div class="triangle_border_up">
div>
<div class="triangle_border_down">
div>
<div class="triangle_border_left">
div>
<div class="triangle_border_right">
div>
body>
html>
带边框的三角形
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>css画带边框的三角形title>
<style type="text/css">
/*向上*/
.triangle_border_up{
width:0;
height:0;
border-width:0 30px 30px;
border-style:solid;
border-color:transparent transparent #333;/*透明 透明 灰*/
margin:40px auto;
position:relative;
}
.triangle_border_up span{
display:block;
width:0;
height:0;
border-width:0 28px 28px;
border-style:solid;
border-color:transparent transparent #fc0;/*透明 透明 黄*/
position:absolute;
top:1px;
left:-28px;
}
/*向下*/
.triangle_border_down{
width:0;
height:0;
border-width:30px 30px 0;
border-style:solid;
border-color:#333 transparent transparent;/*灰 透明 透明 */
margin:40px auto;
position:relative;
}
.triangle_border_down span{
display:block;
width:0;
height:0;
border-width:28px 28px 0;
border-style:solid;
border-color:#fc0 transparent transparent;/*黄 透明 透明 */
position:absolute;
top:-29px;
left:-28px;
}
/*向左*/
.triangle_border_left{
width:0;
height:0;
border-width:30px 30px 30px 0;
border-style:solid;
border-color:transparent #333 transparent transparent;/*透明 灰 透明 透明 */
margin:40px auto;
position:relative;
}
.triangle_border_left span{
display:block;
width:0;
height:0;
border-width:28px 28px 28px 0;
border-style:solid;
border-color:transparent #fc0 transparent transparent;/*透明 黄 透明 透明 */
position:absolute;
top:-28px;
left:1px;
}
/*向右*/
.triangle_border_right{
width:0;
height:0;
border-width:30px 0 30px 30px;
border-style:solid;
border-color:transparent transparent transparent #333;/*透明 透明 透明 灰*/
margin:40px auto;
position:relative;
}
.triangle_border_right span{
display:block;
width:0;
height:0;
border-width:28px 0 28px 28px;
border-style:solid;
border-color:transparent transparent transparent #fc0;/*透明 透明 透明 黄*/
position:absolute;
top:-28px;
left:-29px;
}
style>
head>
<body>
<div class="triangle_border_up">
<span>span>
div>
<div class="triangle_border_down">
<span>span>
div>
<div class="triangle_border_left">
<span>span>
div>
<div class="triangle_border_right">
<span>span>
div>
body>
html>
气泡三角形
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Documenttitle>
<style type="text/css">
.test_triangle_border{
width:200px;
margin:0 auto 20px;
position:relative;
}
.test_triangle_border a{
color:#333;
font-weight:bold;
text-decoration:none;
}
.test_triangle_border .popup{
width:100px;
background:#fc0;
padding:10px 20px;
color:#333;
border-radius:4px;
position:absolute;
top:30px;
left:30px;
border:1px solid #333;
}
.test_triangle_border .popup span{
display:block;
width:0;
height:0;
border-width:0 10px 10px;
border-style:solid;
border-color:transparent transparent #333;
position:absolute;
top:-10px;
left:50%;/* 三角形居中显示 */
margin-left:-10px;/* 三角形居中显示 */
}
.test_triangle_border .popup em{
display:block;
width:0;
height:0;
border-width:0 10px 10px;
border-style:solid;
border-color:transparent transparent #fc0;
position:absolute;
top:1px;
left:-10px;
}
style>
head>
<body>
<div class="test_triangle_border">
<a href="#">三角形a>
<div class="popup">
<span><em>em>span>纯CSS写带边框的三角形
div>
div>
body>
html>