clear { /* generic container (i.e. div) for floating buttons */
    overflow: hidden;
    width: 100%;
	}

a.button {
	margin-left: auto;
    margin-right: auto;
	background: transparent url('bg_button_a.gif') no-repeat scroll top right;
    color: #444;
    display: block;
    float: center;
    font: normal 14px arial, sans-serif;
    height: 24px;
    margin-right: 6px;
    padding-right: 18px; /* sliding doors padding */
    text-decoration: NONE;
	font-weight:bold;
	text-align: center;
	}

a.button span {
    background: transparent url('bg_button_span.gif') no-repeat;
    display: block;
    line-height: 14px;
    padding: 5px 0 5px 18px;
	} 

/*Note: Make sure the span's vertical padding (5 + 5) and line-height (14) amount to the total height of the button (24). Using a different padding, means setting a different height. 

We now have a pretty looking button, but it doesn't exactly give us much visual feedback when we press it. So let's add that finishing touch of CSS: */

a.button:active {
    background-position: bottom right;
    color: #000;
    outline: none; /* hide dotted outline in Firefox */
}

a.button:active span {
    background-position: bottom left;
    padding: 6px 0 4px 18px; /* push text down 1px */
}