代码展示
<h3 class="hover">Hover Me</h3>
<style>
body {
height: 100vh;
margin: 0;
display: grid;
place-content: center;
}
h3 {
font-family: system-ui, sans-serif;
font-size: 3rem;
margin:0;
cursor: pointer;
padding: 0 .1em;
}
.hover {
--b: 0.1em; /* the thickness of the line */
--c: #1095c1; /* the color */
color: #0000;
padding-block: var(--b);
background:
linear-gradient(var(--c) 50%,#000 0) 0% calc(100% - var(--_p,0%))/100% 200%,
linear-gradient(var(--c) 0 0) 0% var(--_p,0%)/var(--_p,0%) var(--b) no-repeat;
-webkit-background-clip: text,padding-box;
background-clip: text,padding-box;
transition: .3s var(--_s,0s) linear,background-size .3s calc(.3s - var(--_s,0s));
}
.hover:hover {
--_p: 100%;
--_s: .3s;
}
</style>