代码奉上：

.flash{
    font-family: Trebuchet MS;
}
.flash:hover{
    animation: glow-in 0.8s both;
}
@keyframes glow-in {
    from {
    opacity:1;
        }
    65% {
      opacity: 1;
      text-shadow: 0 0 25px white;
        }
    75% {
      opacity: 1;
        }
    to {
      opacity: 1;
        }
  }
  

 

实现效果（将背景转黑处理）：

 

<style></style>

This is a paragraph.