JSFiddle - React, Tailwind, and code Playground

HTML

<input type="email" placeholder="Enter username" >

CSS

/* webkit based browsers */
input::-webkit-input-placeholder {
   color: purple;
   text-align: left;
}

/* Firefox 18- */
input:-moz-placeholder 
{
   color: purple;  
}

/* Firefox 19+ */
input::-moz-placeholder
{
   color: purple;  
}

/* Internet Explorer */
input:-ms-input-placeholder 
{  
   color: purple;  
}