下面的代码中画横线的部分是什么意思啊？

<!DOCTYPE html>

<html>

   <head>


   <title>Styling Submit Buttons</title>

   <style type="text/css">

input {
                font-size: 120%;

           color: #5a5854;

           background-color: #f2f2f2;

           border: 1px solid #bdbdbd;

           border-radius: 5px;

           padding: 5px 10px 5px 10px;

                        background-repeat: no-repeat;

                background-position: 8px 9px;

                display: block;

                        margin-bottom: 10px;}

           input#submit {

               color: #444444;

                    text-shadow: 0px 1px 1px #ffffff;

               border-bottom: 2px solid #b2b2b2;

               background-color: #b9e4e3;

                    background: -webkit-gradient(linear, left top, left bottom, from(#beeae9), to(#a8cfce));

               background: -moz-linear-gradient(top, #beeae9, #a8cfce);

               background: -o-linear-gradient(top, #beeae9, #a8cfce);

                    background: -ms-linear-gradient(top, #beeae9, #a8cfce);}

           input#submit:hover {

               color: #333333;

               border: 1px solid #a4a4a4;

               border-top: 2px solid #b2b2b2;

               background-color: #a0dbc4;

               background: -webkit-gradient(linear, left top, left bottom, from(#a8cfce), to(#beeae9));

               background: -moz-linear-gradient(top, #a8cfce, #beeae9);

               background: -o-linear-gradient(top, #a8cfce, #beeae9);

               background: -ms-linear-gradient(top, #a8cfce, #beeae9);}

       </style>

   </head>

   <body>

       <form>

           <input type="submit" value="Register" id="submit" />

       </form>

   </body>

</html>

三蘅

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