使用CSS调整滑块大小

我想将图像的大小保留在滑块中，但我也想减小滑块和菜单栏之间的较大空间。这是一个真正的工具，如果有人向正确的方向指导我，我将不胜感激。我的滑块在自身和菜单栏之间留下了巨大的空白。我是否要在Photoshop中调整图像的大小，然后将其放置在滑块中，还是有其他解决方法？

这是一个演示

这是我的CSS

  div#slider { 
  overflow: hidden;
  min-height: 100px;
  line-height: 100px;
   margin: 25px auto -52px;

   }
        div#slider figure img { 
        width: 20%; 
        float: left;
        margin: 25px auto -52px; 
         }
  `            
        @-webkit-keyframes slidy {
        0% { left: 0%; }
        20% { left: 0%; }
        25% { left: -100%; }
        45% { left: -100%; }
        50% { left: -200%; }
        70% { left: -200%; }
        75% { left: -300%; }
        95% { left: -300%; }
        100% { left: -200%; }
         }




   div#slider figure { 
   position: relative; 
   width: 500%;
   margin: 0;
   top: 0;
   left: 0;
  -webkit-animation: 30s slidy ease-in-out infinite;
   animation: 30s slidy ease-in-out infinite;   
   margin: 25px auto -52px;
   }`div#slider figure { 
   position: relative; 
   width: 500%;
   margin: 0;
   top: 0;
   left: 0;
  -webkit-animation: 30s slidy ease-in-out infinite;
  animation: 30s slidy ease-in-out infinite; 
  margin: 25px auto -52px;
   }


#header {
  margin-right: 10px;
  margin-left: 10px;
  width: 940px;
}
#navigation {
  padding-bottom: 25px;
  margin-top: 26px;
  margin-left: -1.0416667%; 
  padding-right: 1.0416667%; 
  padding-left: 1.0416667%; 
  width: 97.9166667%; 
  background-repeat: repeat-x;
  border-bottom-color: #bfbfbf;
  border-bottom-style: double; border-bottom-width: 4px;
}
#navigation ul li {
  display: inline-block;
}
#navigation ul li a {
  height: 42px;
  line-height: 42px;
  margin-right: 15px;
  text-decoration: none;
  text-transform: uppercase;
  font-family: Arial, "Lucida Grande", Verdana, sans-serif;
  font-size: 15px;
  color: black;
}

和我的HTML：

<div id="slider">
    <figure>
        <img src="images/reciepescover.jpg" alt="">
        <img src="images/history_chocolate.jpg" alt=""> 
        <img src="images/cocoa.jpg" alt="">
        <img src="images/lays.jpg" alt="">
        <img src="images/cocoa.jpg" alt="">
    </figure>
</div>
<center>
    <div id="header">
        <div id="navigation">
            <ul>
                <li><a href="index.html">Home</a></li>
                <li><a href="pages/history.html">History</a></li>
                <li><a href="pages/producers.html">Producers</a></li>
                <li><a href="pages/companies.html">Companies</a></li>
                <li><a href="pages/reciepes.html">Reciepes </a></li>
            </ul>
        </div>