JSFiddle - React, Tailwind, and code Playground

HTML

<div class="separator">
    <hr>
    <a href="#top">To Top</a>
    
</div>
<br><br><br><br><br>

<div class="separator_v2"><a href="#top">To Top</a></div>

CSS

.separator {
    margin-top: 100px;
    text-align: right;
    position: relative;
}

.separator hr {
    position: absolute;
    z-index: 1;
    width: 100%;
}

.separator a {
    position: absolute;
    right: 0px;
    top: 0px;
    font-style: italic;
    background: #fff;
    z-index: 10;
    padding: 2px 20px;
}
.separator_v2 {
    margin-top: 100px;
    text-align: right;
    border-top: 1px solid #000;
    overflow: visible;
}
.separator_v2 a {
    margin-top: -12px;
    display: block;
    font-style: italic;
    background: #fff;
    z-index: 10;
    padding: 2px 20px;
    float: right;
}