Отличная подборка, как нарисовать различные геометрические фигуры одним элементом HTML.
![](https://habrastorage.org/r/w1560/storage1/4dffca97/badfa5f1/5a4006ba/224b2572.png)
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![](https://habrastorage.org/r/w1560/storage1/7c9e0b93/554c3148/7d74c963/c3377db8.png)
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![](https://habrastorage.org/r/w1560/storage1/9a425a0a/623a8029/f0e9a3a8/0fefb238.png)
Квадрат
![](https://habrastorage.org/storage1/4dffca97/badfa5f1/5a4006ba/224b2572.png)
#square {
width: 100px;
height: 100px;
background: red;
}
Прямоугольник
![](https://habrastorage.org/storage1/840360e9/6b232d9d/3d9e73de/3aad7d36.png)
#rectangle {
width: 200px;
height: 100px;
background: red;
}
Круг
![](https://habrastorage.org/storage1/a38809ab/c449b3b1/81916a34/60d1bf4c.png)
#circle {
width: 100px;
height: 100px;
background: red;
-moz-border-radius: 50px;
-webkit-border-radius: 50px;
border-radius: 50px;
}
Овал
![](https://habrastorage.org/storage1/e4ea2624/22ae1f92/6dc9faa0/e180b74d.png)
#oval {
width: 200px;
height: 100px;
background: red;
-moz-border-radius: 100px / 50px;
-webkit-border-radius: 100px / 50px;
border-radius: 100px / 50px;
}
Треугольник вверх
![](https://habrastorage.org/storage1/f3b4d695/0142ea8a/825a8d17/82a9db5d.png)
#triangle-up {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;
}
Треугольник вниз
![](https://habrastorage.org/storage1/b0976571/27acf3b4/8528fa73/04290d77.png)
#triangle-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
}
Треугольник налево
![](https://habrastorage.org/storage1/7c9e0b93/554c3148/7d74c963/c3377db8.png)
#triangle-left {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-right: 100px solid red;
border-bottom: 50px solid transparent;
}
Треугольник направо
![](https://habrastorage.org/storage1/6158519a/aadcef4c/4a9fe831/27351297.png)
#triangle-right {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-left: 100px solid red;
border-bottom: 50px solid transparent;
}
Треугольник в левом верхнем углу
![](https://habrastorage.org/storage1/5f842a45/7109441d/7f2561a0/8afd05f4.png)
#triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid red;
border-right: 100px solid transparent;
}
Треугольник в правом верхнем углу
![](https://habrastorage.org/storage1/dac1a486/650988c1/d8472a94/4a6af362.png)
#triangle-topright {
width: 0;
height: 0;
border-top: 100px solid red;
border-left: 100px solid transparent;
}
Треугольник в левом нижнем углу
![](https://habrastorage.org/storage1/b497063b/66b0afd9/b94f7ecd/4988621f.png)
#triangle-bottomleft {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-right: 100px solid transparent;
}
Треугольник в правом нижнем углу
![](https://habrastorage.org/storage1/ba407979/3df719d7/72f8009b/aca55935.png)
#triangle-bottomright {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-left: 100px solid transparent;
}
Параллелограмм
![](https://habrastorage.org/storage1/559393b4/cbc2d81d/4c483737/3750ea66.png)
#parallelogram {
width: 150px;
height: 100px;
-webkit-transform: skew(20deg);
-moz-transform: skew(20deg);
-o-transform: skew(20deg);
background: red;
}
Трапеция
![](https://habrastorage.org/storage1/6b451cbf/eee96661/843e0fc3/7c94caf4.png)
#trapezoid {
border-bottom: 100px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
height: 0;
width: 100px;
}
Звезда (6-конечная)
![](https://habrastorage.org/storage1/b9bfa076/e613cffc/d555b81e/2292e2e1.png)
#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;
}
Звезда (5-конечная)
![](https://habrastorage.org/storage1/c3d29445/a8e7eeb5/38ac826d/125ef11f.png)
#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;
-moz-transform: rotate(35deg);
-webkit-transform: rotate(35deg);
-ms-transform: rotate(35deg);
-o-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: '';
-webkit-transform: rotate(-35deg);
-moz-transform: rotate(-35deg);
-ms-transform: rotate(-35deg);
-o-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;
-webkit-transform: rotate(-70deg);
-moz-transform: rotate(-70deg);
-ms-transform: rotate(-70deg);
-o-transform: rotate(-70deg);
content: '';
}
Пятиугольник
![](https://habrastorage.org/storage1/f15797d0/4c90d089/6bd9d530/a1873a70.png)
#pentagon {
position: relative;
width: 54px;
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;
}
Шестиугольник
![](https://habrastorage.org/storage1/2b99ddf0/0b19f4dc/0ffe5c69/ebd5e68b.png)
#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;
}
Восьмиугольник
![](https://habrastorage.org/storage1/65115c78/84197318/769e1ea1/442585f9.png)
#octagon {
width: 100px;
height: 100px;
background: red;
position: relative;
}
#octagon:before {
content: "";
position: absolute;
top: 0;
left: 0;
border-bottom: 29px solid red;
border-left: 29px solid #eee;
border-right: 29px solid #eee;
width: 42px;
height: 0;
}
#octagon:after {
content: "";
position: absolute;
bottom: 0;
left: 0;
border-top: 29px solid red;
border-left: 29px solid #eee;
border-right: 29px solid #eee;
width: 42px;
height: 0;
}
Сердечко
![](https://habrastorage.org/storage1/c020f363/06299554/edf9e2a5/175b21a4.png)
#heart {
position: relative;
width: 100px;
height: 90px;
}
#heart:before,
#heart:after {
position: absolute;
content: "";
left: 50px;
top: 0;
width: 50px;
height: 80px;
background: red;
-moz-border-radius: 50px 50px 0 0;
border-radius: 50px 50px 0 0;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-transform-origin: 0 100%;
-moz-transform-origin: 0 100%;
-ms-transform-origin: 0 100%;
-o-transform-origin: 0 100%;
transform-origin: 0 100%;
}
#heart:after {
left: 0;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-transform-origin: 100% 100%;
-moz-transform-origin: 100% 100%;
-ms-transform-origin: 100% 100%;
-o-transform-origin: 100% 100%;
transform-origin :100% 100%;
}
Знак бесконечности
![](https://habrastorage.org/storage1/9a425a0a/623a8029/f0e9a3a8/0fefb238.png)
#infinity {
position: relative;
width: 212px;
height: 100px;
}
#infinity:before,
#infinity:after {
content: "";
position: absolute;
top: 0;
left: 0;
width: 60px;
height: 60px;
border: 20px solid red;
-moz-border-radius: 50px 50px 0 50px;
border-radius: 50px 50px 0 50px;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
}
#infinity:after {
left: auto;
right: 0;
-moz-border-radius: 50px 50px 50px 0;
border-radius: 50px 50px 50px 0;
-webkit-transform:rotate(45deg);
-moz-transform:rotate(45deg);
-ms-transform:rotate(45deg);
-o-transform:rotate(45deg);
transform:rotate(45deg);
}