45個炫酷的 CSS 形狀（值得收藏）

• 1.正方形
• 2.長方形
• 3.圓形
• 4.橢圓形
• 5.上三角
• 6.下三角
• 7.左三角
• 8.右三角
• 9.左上角
• 10.右上角
• 11.左下角
• 12.右下角
• 13.箭頭
• 14.梯形
• 15.平行四邊形
• 16.星星 (6角)
• 17.星星 (5角)
• 18.五邊形
• 19.六邊形
• 20.八邊形
• 21.愛心
• 22.無窮大
• 23.菱形
• 24.鑽石
• 25.鑽戒
• 26.鑽石2
• 27.蛋蛋
• 28.吃豆人
• 29.對話泡泡
• 30. 12點 爆發
• 31. 8點 爆發
• 32.太極
• 33.徽章絲帶
• 34.太空入侵者（電腦遊戲名）
• 35.電視
• 36.雪佛龍
• 37.放大鏡
• 38.Facebook圖標
• 39.月亮
• 40.旗
• 41.圓錐
• 42.十字架
• 43.根基
• 44.指示器
• 45.鎖

1.正方形

#square {
 width: 100px;
 height: 100px
 background: red;
}

2.長方形

#rectangle {
 width: 200px;
 height: 100px;
 background: red;
}

3.圓形

#circle {
 width: 100px;
 height: 100px;
 background: red;
 border-radius: 50%
}

4.橢圓形

#oval {

width: 200px;

height: 100px;

background: red;

border-radius: 100px / 50px;

}

5.上三角

#triangle-up {
 width: 0;
 height: 0;
 border-left: 50px solid transparent; 

 border-right: 50px solid transparent;
 border-bottom: 100px solid red;
}

6.下三角

#triangle-down {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-top: 100px solid red;
}

7.左三角

#triangle-left {
 width: 0;
 height: 0;
 border-top: 50px solid transparent;
 border-right: 100px solid red;
 border-bottom: 50px solid transparent;
}

8.右三角

#triangle-right {
 width: 0;
 height: 0;
 border-top: 50px solid transparent;
 border-left: 100px solid red;
 border-bottom: 50px solid transparent;
} 

9.左上角

#triangle-topleft {

 width: 0;
 height: 0;
 border-top: 100px solid red;
 border-right: 100px solid transparent;
}

10.右上角

#triangle-topright {
 width: 0;
 height: 0;
 border-top: 100px solid red;
 border-left: 100px solid transparent;
}

11.左下角

#triangle-bottomleft {
 width: 0;
 height: 0;
 border-bottom: 100px solid red;
 border-right: 100px solid transparent;
}

12.右下角

#triangle-bottomright {
 width: 0;
 height: 0;
 border-bottom: 100px solid red;
 border-left: 100px solid transparent;
}

13.箭頭

#curvedarrow {
 position: relative;
 width: 0;
 height: 0;
 border-top: 9px solid transparent;
 border-right: 9px solid red;
 transform: rotate(10deg);
}
#curvedarrow:after {
 content: "";
 position: absolute;
 border: 0 solid transparent;
 border-top: 3px solid red;
 border-radius: 20px 0 0 0;
 top: -12px;
 left: -9px;
 width: 12px;
 height: 12px;
 transform: rotate(45deg);
}

14.梯形

#trapezoid {
 border-bottom: 100px solid red;
 border-left: 25px solid transparent;
 border-right: 25px solid transparent;
 height: 0;
 width: 100px;
}

15.平行四邊形

#parallelogram {
 width: 150px;
 height: 100px;
 transform: skew(20deg);
 background: red;
}
 

16.星星 (6角)

#star-six {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-bottom: 100px solid red;
 position: relative;
}
#star-six:after {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-top: 100px solid red;
 position: absolute;
 content: "";
 top: 30px; 

 left: -50px;
}

17.星星 (5角)

#star-five {

margin: 50px 0;

position: relative;

display: block;

color: red;

width: 0px;

height: 0px;

border-right: 100px solid transparent;

border-bottom: 70px solid red;

border-left: 100px solid transparent;

transform: rotate(35deg);

}

#star-five:before {

border-bottom: 80px solid red;

border-left: 30px solid transparent;

border-right: 30px solid transparent;

position: absolute;

height: 0;

width: 0;

top: -45px;

left: -65px;

display: block;

content: '';

transform: rotate(-35deg);

}

#star-five:after {

position: absolute;

display: block;

color: red;

top: 3px;

left: -105px;

width: 0px;

height: 0px;

border-right: 100px solid transparent;

border-bottom: 70px solid red;

border-left: 100px solid transparent;

transform: rotate(-70deg);

content: '';

}

18.五邊形

#pentagon {
 position: relative;
 width: 54px;
 box-sizing: content-box; 

 border-width: 50px 18px 0;
 border-style: solid;
 border-color: red transparent;
}
#pentagon:before {
 content: "";
 position: absolute;
 height: 0;
 width: 0;
 top: -85px;
 left: -18px;
 border-width: 0 45px 35px;
 border-style: solid;
 border-color: transparent transparent red;
}

19.六邊形

#hexagon { 

 width: 100px;
 height: 55px;
 background: red;
 position: relative;
}
#hexagon:before {
 content: "";
 position: absolute;
 top: -25px;
 left: 0;
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-bottom: 25px solid red;
}
#hexagon:after {
 content: "";
 position: absolute;
 bottom: -25px;
 left: 0;
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-top: 25px solid red;
}

20.八邊形

#octagon {
 width: 100px;
 height: 100px;
 background: red;
 position: relative;
}
#octagon:before {
 content: "";
 width: 100px;
 height: 0;
 position: absolute;
 top: 0;
 left: 0;
 border-bottom: 29px solid red;
 border-left: 29px solid #eee;
 border-right: 29px solid #eee;
}
#octagon:after {
 content: "";
 width: 100px;
 height: 0;
 position: absolute;
 bottom: 0;
 left: 0;
 border-top: 29px solid red;
 border-left: 29px solid #eee;
 border-right: 29px solid #eee;
} 

21.愛心

#heart {

position: relative;

width: 100px;

height: 90px;

}

#heart:before,

#heart:after {

position: absolute;

content: "";

left: 50px;

top: 0;

width: 50px;

height: 80px;

background: red;

border-radius: 50px 50px 0 0;

transform: rotate(-45deg);

transform-origin: 0 100%;

}

#heart:after {

left: 0;

transform: rotate(45deg);

transform-origin: 100% 100%;

}

22.無窮大

#infinity {
 position: relative;
 width: 212px;
 height: 100px;
 box-sizing: content-box;
}
#infinity:before,
#infinity:after {
 content: "";
 box-sizing: content-box;
 position: absolute;
 top: 0;
 left: 0;
 width: 60px;
 height: 60px;
 border: 20px solid red;
 border-radius: 50px 50px 0 50px;
 transform: rotate(-45deg);
}
#infinity:after { 

 left: auto;
 right: 0;
 border-radius: 50px 50px 50px 0;
 transform: rotate(45deg);
}

23.菱形

#diamond {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom-color: red;
 position: relative;
 top: -50px;
}
#diamond:after {
 content: '';
 position: absolute; 

 left: -50px;
 top: 50px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top-color: red;
}

24.鑽石

#diamond-shield {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom: 20px solid red;
 position: relative;
 top: -50px;
}
#diamond-shield:after { 

 content: '';
 position: absolute;
 left: -50px;
 top: 20px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top: 70px solid red;
}

25.鑽戒

#diamond-narrow {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom: 70px solid red;
 position: relative;
 top: -50px; 

}
#diamond-narrow:after {
 content: '';
 position: absolute;
 left: -50px;
 top: 70px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top: 70px solid red;
}

26.鑽石2

#cut-diamond {
 border-style: solid;
 border-color: transparent transparent red transparent;
 border-width: 0 25px 25px 25px;
 height: 0; 

 width: 50px;
 box-sizing: content-box;
 position: relative;
 margin: 20px 0 50px 0;
}
#cut-diamond:after {
 content: "";
 position: absolute;
 top: 25px;
 left: -25px;
 width: 0;
 height: 0;
 border-style: solid;
 border-color: red transparent transparent transparent;
 border-width: 70px 50px 0 50px;
}

27.蛋蛋

#egg {
 display: block;
 width: 126px;
 height: 180px;
 background-color: red;
 border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}

28.吃豆人

#pacman {
 width: 0px;
 height: 0px;
 border-right: 60px solid transparent;
 border-top: 60px solid red;
 border-left: 60px solid red;
 border-bottom: 60px solid red;
 border-top-left-radius: 60px;
 border-top-right-radius: 60px; 

 border-bottom-left-radius: 60px;
 border-bottom-right-radius: 60px;
}

29.對話泡泡

#talkbubble {
 width: 120px;
 height: 80px;
 background: red;
 position: relative;
 -moz-border-radius: 10px;
 -webkit-border-radius: 10px;
 border-radius: 10px;
}
#talkbubble:before {
 content: "";
 position: absolute;
 right: 100%; 

 top: 26px;
 width: 0;
 height: 0;
 border-top: 13px solid transparent;
 border-right: 26px solid red;
 border-bottom: 13px solid transparent;
}

30. 12點 爆發

#burst-12 {
 background: red;
 width: 80px;
 height: 80px;
 position: relative;
 text-align: center;
}
#burst-12:before,
#burst-12:after { 

 content: "";
 position: absolute;
 top: 0;
 left: 0;
 height: 80px;
 width: 80px;
 background: red;
}
#burst-12:before {
 transform: rotate(30deg);
}
#burst-12:after {
 transform: rotate(60deg);
}

31. 8點 爆發

#burst-8 {
 background: red; 

 width: 80px;
 height: 80px;
 position: relative;
 text-align: center;
 transform: rotate(20deg);
}
#burst-8:before {
 content: "";
 position: absolute;
 top: 0;
 left: 0;
 height: 80px;
 width: 80px;
 background: red;
 transform: rotate(135deg);
}

32.太極

#yin-yang {
 width: 96px;
 box-sizing: content-box;
 height: 48px;
 background: #eee;
 border-color: red;
 border-style: solid;
 border-width: 2px 2px 50px 2px;
 border-radius: 100%;
 position: relative;
}
#yin-yang:before {
 content: "";
 position: absolute;
 top: 50%;
 left: 0;
 background: #eee;
 border: 18px solid red;
 border-radius: 100%;
 width: 12px;
 height: 12px;
 box-sizing: content-box;
}
#yin-yang:after {
 content: "";
 position: absolute;
 top: 50%;
 left: 50%;
 background: red;
 border: 18px solid #eee;
 border-radius: 100%;
 width: 12px;
 height: 12px;
 box-sizing: content-box;
} 

33.徽章絲帶

#badge-ribbon {
 position: relative;
 background: red;
 height: 100px;
 width: 100px;
 border-radius: 50px;
}
#badge-ribbon:before,
#badge-ribbon:after {
 content: '';
 position: absolute;
 border-bottom: 70px solid red;
 border-left: 40px solid transparent;
 border-right: 40px solid transparent;
 top: 70px;
 left: -10px;
 transform: rotate(-140deg);
}
#badge-ribbon:after {
 left: auto;
 right: -10px;
 transform: rotate(140deg);
}
 

34.太空入侵者（電腦遊戲名）

#space-invader {

box-shadow: 0 0 0 1em red,

0 1em 0 1em red,

-2.5em 1.5em 0 .5em red,

2.5em 1.5em 0 .5em red,

-3em -3em 0 0 red,

3em -3em 0 0 red,

-2em -2em 0 0 red,

2em -2em 0 0 red,

-3em -1em 0 0 red,

-2em -1em 0 0 red,

2em -1em 0 0 red,

3em -1em 0 0 red,

-4em 0 0 0 red,

-3em 0 0 0 red,

3em 0 0 0 red,

4em 0 0 0 red,

-5em 1em 0 0 red,

-4em 1em 0 0 red,

4em 1em 0 0 red,

5em 1em 0 0 red,

-5em 2em 0 0 red,

5em 2em 0 0 red,

-5em 3em 0 0 red,

-3em 3em 0 0 red,

3em 3em 0 0 red,

5em 3em 0 0 red,

-2em 4em 0 0 red,

-1em 4em 0 0 red,

1em 4em 0 0 red,

2em 4em 0 0 red;

background: red;

width: 1em;

height: 1em;

overflow: hidden;

margin: 50px 0 70px 65px;

}

35.電視

#tv {
 position: relative;
 width: 200px;
 height: 150px;
 margin: 20px 0;
 background: red;
 border-radius: 50% / 10%;
 color: white;
 text-align: center;
 text-indent: .1em;
}
#tv:before {
 content: '';
 position: absolute;
 top: 10%;
 bottom: 10%;
 right: -5%;
 left: -5%;
 background: inherit;
 border-radius: 5% / 50%;
}
 

36.雪佛龍

#chevron {
 position: relative;
 text-align: center;
 padding: 12px;
 margin-bottom: 6px;
 height: 60px;
 width: 200px;
}
#chevron:before {
 content: '';
 position: absolute;
 top: 0;
 left: 0;
 height: 100%;
 width: 51%;
 background: red;
 transform: skew(0deg, 6deg);
}
#chevron:after {
 content: '';
 position: absolute;
 top: 0;
 right: 0;
 height: 100%;
 width: 50%;
 background: red;
 transform: skew(0deg, -6deg);
} 

37.放大鏡

#magnifying-glass {
 font-size: 10em;
 display: inline-block;
 width: 0.4em;
 box-sizing: content-box;
 height: 0.4em;
 border: 0.1em solid red;
 position: relative;
 border-radius: 0.35em;
}
#magnifying-glass:before {
 content: "";
 display: inline-block;
 position: absolute;
 right: -0.25em;
 bottom: -0.1em;
 border-width: 0;
 background: red;
 width: 0.35em;
 height: 0.08em;
 transform: rotate(45deg);
}

38.Facebook圖標

#facebook-icon {
 background: red;
 text-indent: -999em;
 width: 100px;
 height: 110px;
 box-sizing: content-box;
 border-radius: 5px;
 position: relative;
 overflow: hidden;
 border: 15px solid red;
 border-bottom: 0;
}
#facebook-icon:before {
 content: "/20";
 position: absolute;
 background: red;
 width: 40px;
 height: 90px;
 bottom: -30px;
 right: -37px;
 border: 20px solid #eee;
 border-radius: 25px;
 box-sizing: content-box;
}
#facebook-icon:after {
 content: "/20";
 position: absolute;
 width: 55px;
 top: 50px;
 height: 20px;
 background: #eee;
 right: 5px;
 box-sizing: content-box;
}

39.月亮

#moon {
 width: 80px;
 height: 80px;
 border-radius: 50%;
 box-shadow: 15px 15px 0 0 red;
} 

40.旗

#flag {
 width: 110px;
 height: 56px;
 box-sizing: content-box;
 padding-top: 15px;
 position: relative;
 background: red;
 color: white; 

 font-size: 11px;
 letter-spacing: 0.2em;
 text-align: center;
 text-transform: uppercase;
}
#flag:after {
 content: "";
 position: absolute;
 left: 0;
 bottom: 0;
 width: 0;
 height: 0;
 border-bottom: 13px solid #eee;
 border-left: 55px solid transparent;
 border-right: 55px solid transparent;
}

41.圓錐

 #cone {
 width: 0;
 height: 0;
 border-left: 70px solid transparent;
 border-right: 70px solid transparent;
 border-top: 100px solid red;
 border-radius: 50%;
}

42.十字架

#cross {
 background: red;
 height: 100px;
 position: relative;
 width: 20px;
}
#cross:after {
 background: red; 

 content: "";
 height: 20px;
 left: -40px;
 position: absolute;
 top: 40px;
 width: 100px;
}

43.根基

 #base {
 background: red;
 display: inline-block;
 height: 55px;
 margin-left: 20px;
 margin-top: 55px;
 position: relative;
 width: 100px;
} 

#base:before {
 border-bottom: 35px solid red;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 content: "";
 height: 0;
 left: 0;
 position: absolute;
 top: -35px;
 width: 0;
}

44.指示器

#pointer {
 width: 200px;
 height: 40px;
 position: relative;
 background: red; 

}
#pointer:after {
 content: "";
 position: absolute;
 left: 0;
 bottom: 0;
 width: 0;
 height: 0;
 border-left: 20px solid white;
 border-top: 20px solid transparent;
 border-bottom: 20px solid transparent;
}
#pointer:before {
 content: "";
 position: absolute;
 right: -20px;
 bottom: 0;
 width: 0;
 height: 0;
 border-left: 20px solid red;
 border-top: 20px solid transparent;
 border-bottom: 20px solid transparent;
}

45.鎖

#lock {
 font-size: 8px;
 position: relative;
 width: 18em;
 height: 13em;
 border-radius: 2em;
 top: 10em;
 box-sizing: border-box;
 border: 3.5em solid red;
 border-right-width: 7.5em;
 border-left-width: 7.5em;
 margin: 0 0 6rem 0;
}
#lock:before {
 content: "";
 box-sizing: border-box;
 position: absolute;
 border: 2.5em solid red;
 width: 14em;
 height: 12em;
 left: 50%;
 margin-left: -7em;
 top: -12em;
 border-top-left-radius: 7em;
 border-top-right-radius: 7em;
}
#lock:after {
 content: "";
 box-sizing: border-box;
 position: absolute;
 border: 1em solid red;
 width: 5em;
 height: 8em;
 border-radius: 2.5em;
 left: 50%;
 top: -1em;
 margin-left: -2.5em;
}