title: Why (className:hover + className) is not working on my page?
body: <p>I'm stuck in my html page to appear the other class element when hovering different element.
  I use (+) to display my pop-item when the serc-item is hover.</p>
  <p>here is my code</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.serv-item{
    margin: 10px 60px 0 0; 
    display: inline;
  }
  .serv-item a{
    color: #fff;
    display: inline-block;
    text-align: center;
    background-image: url("../img/serv1.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    width: 15%;
    height: 250px;
  }
  .serv-item a h3{
    font-family: 'Dosis', sans-serif !important;
    font-size: 20px;
    padding-top: 100px;
  }
  
  .serv-item:hover + .pop-info{/*Here i use + to display my h4 when serv-item is hover*/
    opacity: .7;
    display: inline-block;
  }
  .pop-info{
    display:none;
    position: relative;
    font-family: 'Dosis', sans-serif !important;
    font-size: 11px;
    margin-top: 25px;
    padding: 8px;
    border: 2px solid #fff;
    font-weight: bold;
    letter-spacing: .1em;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>        &lt;div class="serv-list"&gt;
            &lt;div class="serv-item"&gt;
              &lt;a href="#"&gt;
                  &lt;h3&gt;ITEM 1&lt;/h3&gt;
                  &lt;h4 class="pop-info"&gt;VIEW OFFER&lt;/h4&gt;&lt;!--This is I want to display when serv-item is hover, because I set this to display none--&gt;&gt; 
              &lt;/a&gt;
            &lt;/div&gt;
            &lt;div class="serv-item"&gt;
              &lt;a href="#"&gt;
                  &lt;h3&gt;ITEM 3&lt;/h3&gt;
                  &lt;h4 class="pop-info"&gt;VIEW OFFER&lt;/h4&gt;
              &lt;/a&gt;
            &lt;/div&gt;
          &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  <p>I already search this on google and it show like similar to my code but I don't know why mine is not working, thanks in advance for someone can teach me what is my error.</p>