Css实现坐标点位效果

 <div class="student_icon_three">
    <img src="../assets/about-three.webp" alt="" />
 </div>
<style>
.student_icon_three {
  width: 6%;
  height: 100px;
  position: absolute;
  top: 44%;
  left: 40.5%;
}
.student_icon_three:before {
  content: "";
  height: 70px;
  width: 70px;
  border: 7px solid #048da0;
  display: block;
  position: absolute;
  top: 2px;
  left: 0px;
  z-index: 1;
  background: #fff;
  border-radius: 40px;
  -webkit-border-radius: 40px;
  -moz-border-radius: 30px;
  color: #fff;
  text-align: center;
}
.student_icon_three:after {
  content: "";
  height: 0;
  width: 0%;
  display: block;
  position: absolute;
  bottom: -49px;
  left: 1px;
  border: 10px transparent solid;
  border-top-color: #048da0;
  border-width: 91px 40px 0px 42px;
}
.student_icon_three img {
  width: 55%;
  height: 73px;
  position: absolute;
  top: 5%;
  left: 9.5%;
  z-index: 1;
}
<style>