css实现纯加号

<!DOCTYPE html>  
<html>  
<head>  
<style>  
.circle-plus {  
  position: relative;  
  width: 50px;  
  height: 50px;  
  border-radius: 50%;  
  background-color: #3498db;  
  display: flex;  
  align-items: center;  
  justify-content: center;  
}  
  
.circle-plus::before, .circle-plus::after {  
  content: '';  
  position: absolute;  
  background-color: #fff;  
}  
  
.circle-plus::before {  
  width: 2px;  
  height: 20px;  
  top: 15px;  
  left: 24px;  
}  
  
.circle-plus::after {  
  width: 20px;  
  height: 2px;  
  top: 24px;  
  left: 15px;  
}  
</style>  
</head>  
<body>  
  
<div class="circle-plus"></div>  
  
</body>  
</html>