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CSS3 邊框 CSS3 邊框圓角 ... ...

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CSS3 邊框</title>
<style>
body, ul, li, dl, dt, dd, h1, h2, h3, h4, h5 {
margin: 0;
padding: 0;
}
body {
background-color: #F7F7F7;
}
.wrapper {
width: 1000px;
margin: 0 auto;
padding: 20px;
box-sizing: border-box;
}
header {
padding: 20px 0;
margin-bottom: 20px;
text-align: center;
}
header h3 {
line-height: 1;
font-weight: normal;
font-size: 28px;
}
.main {
/*overflow: hidden;*/
}
.main:after {
content: '';
clear: both;
display: block;
}
.main .item {
width: 210px;
height: 210px;
margin: 0 30px 30px 0;
display: flex;
position: relative;
background-color: #FFF;
float: left;
box-shadow: 2px 2px 5px #CCC;
}
.main .item:after {
content: attr(data-brief);
display: block;
width: 100%;
height: 100%;
text-align: center;
line-height: 210px;
position: absolute;
top: 0;
left: 0;
color: #FFF;
font-family: '微軟雅黑';
font-size: 18px;
background-color: rgba(170, 170, 170, 0);
z-index: -1;
transition: all 0.3s ease-in;
}
.main .item:hover:after {
background-color: rgba(170, 170, 170, 0.6);
z-index: 100;
}
.main .item:nth-child(4n) {
margin-right: 0;
}
/*.main .item:nth-last-child(-n+5) {
margin-bottom: 0;
}*/
/* 以上是骨架樣式 */
/* 1、2、3、4 順時針 */
.border-radius {
width: 180px;
height: 180px;
margin: auto;
border: 1px solid red;
/*border-radius: 50% 30% 20%;*/
}
.square {
border-radius: 0;
}
/*拱形*/
.item:nth-child(1) .border-radius {
border-radius: 90px;
}
/*拱形*/
.item:nth-child(2) .border-radius {
border-radius: 90px 90px 0 0;
}
/*半圓*/
.item:nth-child(3) .border-radius {
height: 90px;
border-radius: 90px 90px 0 0;
}
/*左上角*/
.item:nth-child(4) .border-radius {
/*height: 90px;*/
border-radius: 90px 0 0 0;
}
/*四分之一圓*/
.item:nth-child(5) .border-radius {
width: 90px;
height: 90px;
border-radius: 90px 0 0 0;
}
/*橫著的橢圓*/
.item:nth-child(6) .border-radius {
height: 90px;
/*border-radius: 50%;*/
border-radius: 90px 90px 90px 90px / 45px 45px 45px 45px;
/*border-radius: 45px / 90px;*/
}
/*豎著的橢圓*/
.item:nth-child(7) .border-radius {
width: 90px;
border-radius: 45px 45px 45px 45px / 90px 90px 90px 90px;
}
/*半個橫著的橢圓*/
.item:nth-child(8) .border-radius {
height: 45px;
border-radius: 90px 90px 0 0 / 45px 45px 0 0;
}
/*半個豎著的橢圓*/
.item:nth-child(9) .border-radius {
width: 45px;
border-radius: 45px 0 0 45px / 90px 0 0 90px;
}
/*四分之一豎著的橢圓*/
.item:nth-child(10) .border-radius {
width: 45px;
height: 90px;
border-radius: 45px 0 0 0 / 90px 0 0 0;
}
/*餅環*/
.item:nth-child(11) .border-radius {
width: 40px;
height: 40px;
border: 70px solid red;
border-radius: 90px;
}
/*圓餅*/
.item:nth-child(12) .border-radius {
width: 40px;
height: 40px;
border: 70px solid red;
border-radius: 60px;
}
/*左上角圓餅*/
.item:nth-child(13) .border-radius {
width: 60px;
height: 60px;
border: 60px solid red;
border-radius: 90px 0 0 0;
}
/*對角圓餅*/
.item:nth-child(14) .border-radius {
width: 60px;
height: 60px;
border: 60px solid red;
border-radius: 90px 0 90px 0;
}
/*四邊不同色*/
.item:nth-child(15) .border-radius {
width: 0px;
height: 0px;
border-width: 90px;
border-style: solid;
border-color: red green yellow blue;
}
/*右透明色*/
.item:nth-child(16) .border-radius {
width: 0px;
height: 0px;
border-width: 90px;
border-style: solid;
border-color: red green yellow blue;
border-right-color: transparent;
}
/*圓右透明色*/
.item:nth-child(17) .border-radius {
width: 0px;
height: 0px;
border-width: 90px;
border-style: solid;
border-color: red;
border-right-color: transparent;
border-radius: 90px;
}
/*圓右紅透明色*/
.item:nth-child(18) .border-radius {
width: 0px;
height: 0px;
border-width: 90px;
border-style: solid;
border-color: transparent;
border-right-color: red;
border-radius: 90px;
}
/*陰陽圖前世*/
.item:nth-child(19) .border-radius {
width: 180px;
height: 0px;
border-top-width: 90px;
border-bottom-width: 90px;
border-style: solid;
border-top-color: red;
border-bottom-color: green;
/*border-right-color: red;*/
border-radius: 90px;
}
/*陰陽圖前世2*/
.item:nth-child(20) .border-radius {
width: 180px;
height: 90px;
border-bottom-width: 90px;
border-style: solid;
border-bottom-color: green;
background-color: red;
/*border-right-color: red;*/
border-radius: 90px;
}
/*陰陽圖今生*/
.item:nth-child(21) .border-radius {
width: 180px;
height: 90px;
border-bottom-width: 90px;
border-style: solid;
border-bottom-color: green;
background-color: red;
border-radius: 90px;
position: relative;
}
.item:nth-child(21) .border-radius::after,
.item:nth-child(21) .border-radius::before {
content: '';
position: absolute;
top: 50%;
width: 20px;
height: 20px;
/*margin: -10px 0 0 0;*/
border-width: 35px;
border-style: solid;
/*border-radius: 45px;*/
}
/*左陰陽*/
.item:nth-child(21) .border-radius::after {
background-color: red;
border-color: green;
}
/*右陰陽*/
.item:nth-child(21) .border-radius::before {
background-color: green;
border-color: red;
right: 0;
}
</style>
</head>
<body>
<div class="wrapper">
<header>
<h3>CSS3 邊框圓角</h3>
</header>
<div class="main">
<div class="item" data-brief="整圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="拱形">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="半圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="左上角">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="四分之一圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="橫著的橢圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="豎著的橢圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="半個橫著的橢圓">
<div class="border-radius"></div>
</div>
<div class="item" data-brief="