.triangle{width:0;height:0;border-width:50px;border-style:solid;border-color:red blue green yellow;}.triangle_top{width:0;height: 0;border-width:50px;border-style:solid;border-color:red transparent transparent transparent;}.triangle_right{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent blue transparent transparent;}.triangle_bottom{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent transparent green transparent;}.triangle_left{width:0;height: 0;border-width:50px;border-style:solid;border-color:transparent transparent transparent yellow;}

<style>.pie38{width: 100px;height: 100px;border-radius: 50px;margin:20px;background-color: #ddd;position: relative;display: inline-block;overflow: hidden}.pie38 .pie_content{line-height: 100px;text-align: center;position: absolute;width: 100px;height: 100px;z-index: 8}.pie38 .pie_left{position: absolute;top:0;left:0;width: 50px;height: 100px;overflow: hidden;}.pie38 .pie_left:after{content: '';height: 100px;width:50px;border-right:50px solid red;position:absolute;top:0;left:0;transform: rotate(-137deg);}</style><div class="pie38"> <div class="pie_content">38%</div> <div class="pie_left"></div></div><style>.pie88{width: 100px;height: 100px;border-radius: 50px;margin:20px;background-color: #ddd;position: relative;display: inline-block;overflow: hidden;}.pie88 .pie_content{line-height: 100px;text-align: center;position: absolute;width: 100px;height: 100px;z-index: 8}.pie88 .pie_left{position: absolute;top:0;left:0;width: 50px;height: 100px;overflow: hidden;background-color: red}.pie88 .pie_right{position: absolute;top:0;right:0;width: 50px;height: 100px;overflow: hidden;}.pie88 .pie_right:after{content: '';height: 100px;width:50px;border-left:50px solid red;position:absolute;right:0;top:0;border-radius: 50px;transform: rotate(-137deg);}</style><div class="pie88"> <div class="pie_content">88%</div> <div class="pie_left"></div> <div class="pie_right"></div></div>