纯CSS实现绘制各种三⾓形（各种⾓度）
⼀、前⾔
三⾓形实现原理：宽度width为0；height为0；（1）有⼀条横竖边（上下左右）的设置为border-⽅向：长度 solid red，这个画的就是底部的直线。其他边使⽤border-⽅向：长度 solid transparent。（2）有两个横竖边（上下左右）的设置，若斜边是在三⾓形的右边，这时候设置top或bottom的直线，和右边的斜线。若斜边是在三⾓形的左边，这时候设置top或bottom 的直线，和左边的斜线。
⼆、实现月的成语
2.1 Triangle Up
#triangle-up {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
抗过敏牙膏border-bottom: 100px solid red;
}
2.2 Triangle Down
#triangle-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
}
2.3 Triangle Left
不负韶光#triangle-left {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-right: 100px solid red;
border-bottom: 50px solid transparent;
}
2.4 Triangle Right
#triangle-right {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-left: 100px solid red;
border-bottom: 50px solid transparent;
}
2.5 Triangle Top Left
#triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid red;
pro6
border-right: 100px solid transparent;
}
2.6 Triangle Top Right
#triangle-topright {
怎么做糖果
width: 0;
height: 0;
border-top: 100px solid red;
border-left: 100px solid transparent;
}
2.7 Triangle Bottom Left
#triangle-bottomleft {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-right: 100px solid transparent;
扬鞭自奋蹄}
2.8 Triangle Bottom Right
体前变向#triangle-bottomright {
width: 0;
height: 0;
border-bottom: 100px solid red;子二代
border-left: 100px solid transparent;
}
