纯CSS创建各种不同的图形形状

矩形
.rectangle {
    width: 250px;
    height: 150px;
    background-color: #6DC75F;
}
<div class="rectangle"></div>  
三角形
.triangleUp {
            border-left: 75px solid transparent;
            border-right: 75px solid transparent;
            border-bottom: 150px solid  #6DC75F;
            width: 0;
            height: 0;
        }

<div class="triangleUp"></div>  
椭圆形
.oval {
    width: 300px;
    height: 150px;
    background: #6DC75F;
    -moz-border-radius: 150px / 75px;
    -webkit-border-radius: 150px / 75px;
    border-radius: 150px / 75px;
}

<div class="oval"></div>  
月牙形
.moon {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  box-shadow: 15px 15px 0 0 green;
}

<div class="moon"></div>  
树叶
.leaf {
    border-radius: 5px 300px 3px 300px;
    background: #6DC75F;
    width: 150px;
    height: 150px;
}

<div class="leaf"></div>