you have to write button outside div like this and remove the position absolute otherwise you won't get the animation.
HTML
<button id="btn">Button</button>
<div id="slidebottom" style="position: relative;">
<div>
Slide from top and down<br>
Slide from top and down<br>
Slide from top and down
</div>
</div>
JAVASCRIPT
$('#btn').click(function(){
$('#slidebottom').stop().slideToggle('slow');
});
jsfiddle link is here