JSFiddle - React, Tailwind, and code Playground

HTML

<div class="my">
   <span>Текст текст</span>
</div>

CSS

.my{
  width:100px;
  box-shadow: 0 0 10px rgba(0,0,0,1); /* Параметры тени */
    padding: 10px;
}
span{
  border-bottom: 3px dashed blue;
}