JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
    <div class="container-fluid" id="login-cover"></div>
</div>

CSS

#login-cover {
     position:absolute;
     background-repeat:no-repeat;
    
     width:100%;
     height: 90%;
     top:0px;
     left:0px;
     right: 0px;
 }
  #wrap {
     height: 90%;
     margin: 0 auto 0;
 }

JavaScript

var a= "http://media1.santabanta.com/full2/Indian%20%20Celebrities(F)/Sonam%20Kapoor/sonam-kapoor-40a.jpg"; 
$("#login-cover").css('background-image', 'url("' + a + '")');