JSFiddle - React, Tailwind, and code Playground

HTML

<a href="##">test 1</a>
<a href="##">test 2</a>

<div class="dark">
   <a href="##">test 1</a>
   <a href="##">test 2</a> 
</div>

CSS

a {
    color: #000;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

a:hover {
    color: #ff0000;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

.dark a {
    color: #ff0000;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

.dark a:hover {
    color: #000;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}