JSFiddle - React, Tailwind, and code Playground

HTML

<div class="icon_pos"> 
    <div class="icon_style"><a href="">Link →</a></div>
    <div class="help1">+7 123 123 12 21</div> 
</div>

CSS

.help1{
visibility: hidden;
}

.icon_style {
background: red;
    font-size:24px; color:white;
    width: 128px;
}

.icon_style a {
display:block;
}

.icon_pos:hover .help1{
visibility: visible;

}