完成的效果如下

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查看效果并下载

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Step 1：先了解border的原理：

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Step 2：HTML代码结构

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  	<section class="playContainer">
      <li class="playBtn">
  		<a href="#" title="start">Start</a>
  	  </li>
      <li class="pauseBtn">
  		<a href="#" title="pause">Pause</a>
  	  </li>
      <li class="stopBtn">
  		<a href="#" title="stop">Stop</a>
  	  </li>
      <li class="forwardBtn playBtn">
      	<a href="#" title="forward">Forward</a>
  		<a href="#" title="forward">Forward</a>
  	  </li>
      <li class="rewindBtn">
      	<a href="#" title="rewind">Rewind</a>
  		<a href="#" title="rewind">Rewind</a>
  	  </li>
  	  <li class="ejectBtn">
  	  	<a href="#" class="arrow">Eject</a>
  	  	<a href="#" class="dash">Eject</a>
  	  </li>
  	</section>

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Step 3：画背景圆，position：relative

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.playContainer li { position: relative; float: left; border: 25px solid #404040; color: #404040; height: 0; width:0; -webkit-border-radius: 100%; -moz-border-radius: 100%; -o-border-radius: 100%; border-radius: 100%; margin: 0 20px; }

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Step 4：画stop按钮，要让按钮居中。

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按钮相对外层圆圈绝对定位，从圆圈的中心开始，所以要调整top和left值

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stop按钮边长14px，相对原点需要向上、向左移动7个像素，居中。

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全部的CSS如下：

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        .playContainer { position: relative; float: left; background: rgba(0, 0, 0, 0.8); padding: 20px; }
    	.playContainer li { position: relative; float: left; border: 25px solid #404040; color: #404040; height: 0; width:0; -webkit-border-radius: 100%; -moz-border-radius: 100%; -o-border-radius: 100%; border-radius: 100%; margin: 0 20px; }
    	.playContainer a { border-style: solid; text-indent: -9999px; position: absolute; top: -8px; left: -3px;  }

    	.playBtn a { border-color: transparent transparent transparent #fff; border-width: 8px 0 8px 12px;  width: 0; height: 0; }
    	.pauseBtn a { border-color: transparent white;  border-width: 0 6px; height: 15px; width: 6px; left: -9px; }
    	.stopBtn a { border: 7px solid #fff; height: 0; width: 0; left: -7px; top: -7px;}
    	.forwardBtn a { border-left-width: 8px; left: 1px; }
    	.forwardBtn a:first-child { margin-left: -7px;  }

    	.rewindBtn a { border-width: 8px 8px 8px 0; border-color: transparent #fff transparent transparent; width: 0; height: 0; }
    	.rewindBtn a:first-child { margin-left: -7px; }

    	.ejectBtn a.arrow { border-width: 0 8px 8px 8px; border-color: transparent transparent #fff transparent; top:-26px; left:-8px; }
		.ejectBtn a.dash { border-width: 0 0 4px; border-color: transparent transparent #fff; height: 0; width:16px; left: -8px; top: 4px; }

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