纯css基本图形

常用基本图形：

圆形

image.png

. round {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: red;
}

上三角

image.png

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

下三角

image.png

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

左三角

image.png

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

右三角

image.png

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

左上三角

image.png

.triangele-topleft {
    width: 0;
    height: 0;
    border-top: 100px solid red; 
    border-right: 100px solid transparent;          
}

右上三角

image.png

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

左下三角

image.png

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

右下三角

image.png

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

平行四边形

image.png

.parallelogram {
  width: 150px;
  height: 100px;
  margin-left:20px;
  transform: skew(20deg);
  background: red;
}

五角星

image.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;
  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: '';
}