Tizen - how to change button font-size - fixed

Question

how can I change a button font-size? when I tried to change it with css, this changes didn't work and also buttons lost data-style: round attribute. I have an html app and button just open another page, here is it:

<p><a href="two.html" data-role="button"
                 data-style="round" id="btn" style="border: 5;
                  background: #FFFFFF">
                test</a></p>

css:

   #btn {
        width: 250px;  height: 40px;
        margin: 0 auto;
        /*data-style: round;*/
        border: #000000;
        border-style: solid;
        border-width: 5px;
        font-family:"Times New Roman", Times, serif;
        font-size: 8pt;

        }

Solution founded in the answer below

Answer 1

Fixed:

#btn span {
    text-align : right;
    font-size : 10px;
}

Answer 2

why don't you try something like thisin the css

border-radius:8px ;
-moz-border-radius:8x;
-webtrik-border-radius:8px