css - Nav Tab active moment image not change -


im added tab image icon , im try when click button (active button) after image icon change book_hover.png font color change image icon not change ,how replace image after navtab active moment 

.footer-tab .tooter-nav-tab {    padding: 2rem;    height: 10vh;    width: 100%;    margin-left: 0rem;    background: white;    border-top: 1px solid #c9cfd9;    display: inline;    text-align: center;  }    p.tab-txt {    font-size: 0.7rem;  }    .footer-tab ul {    list-style-type: none;    margin: 0;    padding: 0;    border-top: 1px solid #c9cfd9;    overflow: hidden;    background-color: #ffffff;  }    .footer-tab li {    float: left;  }    .footer-tab .nav-tabs .nav-link.active {    color: white;      background-color: #8bb6f3;    border-color: #ddd #ddd #fff;  }    .footer-tab li {    display: block;    color: #3f5370;    text-align: center;    padding: 18px 16px;    text-decoration: none;  }    .footer-tab li a:hover {    background-color: #8bb6f3;    color: white;  }    .footer-tab-img :active {    background:url'https://image.ibb.co/ffsy9f/book_hover.png')no-repeat;    color: white;  }  /*footernavtab*/
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>  <div class="footer-tab">    <ul class="nav nav-tabs" role="tablist">      <li class="img-01 w-25"><a href="" class="nav-link"}}    				<span class="footer-tab-img active">  					<a href="#"><img src="https://image.ibb.co/mohjbv/book.png" alt="book" border="0"></a>  					</span>          <p class="tab-txt">book</p>     </a>      </li>      </ul>      </div>

finally fixed issue, im used class footer-tab-img-01 , added separate color image , code crete 

`span.footer-tab-img-01 { background: url('/image/users.png') no-repeat; width: 32px; height: 32px; display: block; margin-left:1.2rem; }  .nav-link.active span.footer-tab-img-01 { background: url('/image/users-hover.png') no-repeat; width: 32px; height: 32px; display: block; margin-left:1.2rem; }` 
<div class="footer-tab">   <ul class="nav nav-tabs" role="tablist">     <li class="img-01 w-25"><a href="" class="nav-link"}}                  <span class="footer-tab-img-01">                      </span>         <p class="tab-txt">book</p>    </a>     </li>     </ul>     </div>

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