奇妙的 CSS幾何圖形

三角形：一般會使用透明的border模擬出一個三角形：▲

.traingle { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid yellowgreen;
}

 

切角：採用多重線性漸變實現切角 

.notching { width: 40px; height: 40px; padding: 40px; background: linear-gradient(135deg, transparent 15px, yellowgreen 0) top left, linear-gradient(-135deg, transparent 15px, yellowgreen 0) top right, linear-gradient(-45deg, transparent 15px, yellowgreen 0) bottom right, linear-gradient(45deg, transparent 15px, yellowgreen 0) bottom left; background-size: 50% 50%; background-repeat: no-repeat;
}

 

梯形：利用僞元素加旋轉透視實現梯形

 .trapezoid{ position: relative; width: 60px; padding: 60px;
} .trapezoid::before{ content:""; position: absolute; top: 0; right: 0; bottom: 0; left: 0; transform: perspective(20px) scaleY(1.3) rotateX(5deg); transform-origin: bottom; background: yellowgreen;
}

 

固然，還有另外一種更簡單的方法是利用border實現，藉助上面的構造三角形的方法，在矩形兩側構造兩個透明的三角形

.trapezoid { position: relative; width: 60px; border-top: 60px solid yellowgreen; border-left: 40px solid transparent; border-right: 40px solid transparent;
}

 

五邊形：梯形加上三角形，很容易就組合成一個五邊形，這裏須要藉助一個僞元素實現

.pentagon { position: relative; width: 60px; border-bottom: 60px solid yellowgreen; border-left: 40px solid transparent; border-right: 40px solid transparent; 
} .pentagon::before { content:""; position: absolute; top: 60px; left: -40px; border-top: 60px solid yellowgreen; border-left: 70px solid transparent; border-right: 70px solid transparent;
}

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六邊形：看看上面的梯形，若是兩個反方向且底邊一樣大小的梯形，疊加在一塊兒，是否是就能獲得一個六邊形呢？

.pentagon { position: relative; width: 60px; border-bottom: 60px solid yellowgreen; border-left: 40px solid transparent; border-right: 40px solid transparent;
} .pentagon::before { content: ""; position: absolute; width: 60px; height: 0px; top: 60px; left: -40px; border-top: 60px solid yellowgreen; border-left: 40px solid transparent; border-right: 40px solid transparent;
}

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八邊形：六邊形都解決了，八邊形也不在話下，一個矩形加上兩個梯形，能夠合成一個八邊形

.octagon { position: relative; width: 40px; height: 100px; background: yellowgreen;
} .octagon::before { content: ""; height: 60px; position: absolute; top: 0; left: 40px; border-left: 30px solid yellowgreen; border-top: 20px solid transparent; border-bottom: 20px solid transparent;
} .octagon::after { content: ""; height: 60px; position: absolute; top: 0; left: -30px; border-right: 30px solid yellowgreen; border-top: 20px solid transparent; border-bottom: 20px solid transparent;
}

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五角星：3 個三角形疊加旋轉在一塊兒實現 ★

.star { margin: 50px 0; position: relative; width: 0; border-right: 100px solid transparent; border-bottom: 70px solid yellowgreen; border-left: 100px solid transparent; transform: rotate(35deg) scale(.6);
} .star:before { content: ‘‘; position: absolute; border-bottom: 80px solid yellowgreen; border-left: 30px solid transparent; border-right: 30px solid transparent; top: -45px; left: -65px; transform: rotate(-35deg);
} .star:after { content: ‘‘; position: absolute; top: 3px; left: -105px; border-right: 100px solid transparent; border-bottom: 70px solid yellowgreen; border-left: 100px solid transparent; transform: rotate(-70deg);
}

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六角星：一個向上的三角形 ▲，疊加上一個向下的三角形 ▼，就能夠獲得一個六邊形

.sixstar { position: relative; width: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid yellowgreen;
} .sixstar:after { content: ""; position: absolute; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid yellowgreen; top: 30px; left: -50px;
}

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八角星：其實使用兩個矩形進行旋轉拼接就能夠了

.eightstar { position: relative; width: 100px; height: 100px; background-color: yellowgreen; transform: rotate(30deg);
} .eightstar::before { content: ""; position: absolute; top: 0; left: 0; width: 100px; height: 100px; transform: rotate(45deg); background-color: yellowgreen;
}

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十二角星： 最後多角星再來一個十二級角星。在八角星的基礎上，再增長一個矩形，就能獲得十二角啦。也就是要過第一個僞元素。

.twelvestar { position: relative; width: 100px; height: 100px; margin-bottom: 100px!important; background-color: yellowgreen; transform: rotate(30deg);
} .twelvestar::before { content: ""; position: absolute; top: 0; left: 0; width: 100px; height: 100px; transform: rotate(30deg); background-color: yellowgreen;
} .twelvestar::after { content: ""; position: absolute; top: 0; left: 0; width: 100px; height: 100px; transform: rotate(60deg); background-color: yellowgreen;
}

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橢圓：使用傳統的方法畫一個橢圓，過去 CSS3 畫橢圓，基本上只能藉助 border 實現

.ellipse { #這裏使用 border 畫一個蛋的形狀 width: 120px; height: 160px; background-color: yellowgreen; border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}

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