CSSで別の画像の上にある画像を取得するにはどうすればよいですか? グリッドにある各画像の上に小さな虫眼鏡アイコンを表示しようとしています。
副次的な質問として、CSS の # を削除して に変更するにはどうすればよいですか。
ul#grid {
  list-style: none;
  margin: 60px auto 0;
  width: 1200px; 
   }
#grid li span {
  display:inline;
  color: white;
  display:block;
  bottom:225px;
  position:relative;
  width:180px;
   }
#grid li {
  display:inline-block;
  position: relative;
  float: left;
  margin: 0 40px 75px 0px;
  display:inline;
  position:relative;
   }
#grid li a:hover img {
  -webkit-transition: opacity .3s ease-in;
  -moz-transition: opactiy .3s ease-in;
  -ms-transition: opacity .3s ease-in;
  -o-transition: opacity .3s ease-in;
  transition: opacity .3s ease-in;
  opacity: 1;
   }
#grid:hover li {
   -webkit-transition: opacity .3s ease-in;
   -moz-transition: opactiy .3s ease-in;
   -ms-transition: opacity .3s ease-in;
    -o-transition: opacity .3s ease-in;
    transition: opacity .3s ease-in;
    zoom: 1;
    filter: alpha(opacity=100);
    opacity: 0.3;
      }
 #grid li img {
   margin: 0;
   width: 339px;
   height: 211px;
   position:relative;
    }
#grid:hover li:hover {
  opacity: 1;
  }
#grid img::selection { background-color: transparent; }
#hidden{
  position:absolute;
  width: 1100px;
  height:670px;
  top:0px;
  z-index:-1;
  }
HTML
 <div class="portfolio">
  <ul id="grid">   
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
   <li><a href="#"><img src="http://collider.com/wp-content/uploads/steve-wozniak-image.jpg"><span>Woz!!!!!!!!!!!!</span></a></li>
 </ul></div>
<div id="hidden">