Actually, this too works great.
input[type=submit]{
width: 15px;
position: absolute;
right: 20px;
bottom: 20px;
background: #09c;
color: #fff;
font-family: tahoma,geneva,algerian;
height: 30px;
-webkit-border-radius: 15px;
-moz-border-radius: 15px;
border-radius: 15px;
border: 1px solid #999;
}