JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" class="text-box" value="Only text-box" />
<input type="text" class="multi-line" value="Only multi-line" />
<input type="text" class="text-box multi-line" value="Both" />

CSS

.text-box{
 background-color:red;   
}

.multi-line{
 background-color:blue;   
}
.text-box.multi-line{
  background-color:black; 
  color:white;  
height: 6.5em;
}