The suggested solution to the problem of visible scrollbars does not work in the below scenario :
CSS:
#hider {
    position:absolute;
    top: 0;
    left:0;
    height: 400px;
    width: 200px;
    background-color: green;
    overflow: hidden;
}
#scroller {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    padding-right: 20px;
    padding-bottom: 20px;
    overflow: auto;
}
#content {
    float: left;
    height: auto;
    width: auto;
}
HTML:
<div id="hider">
    <div id="scroller">
        <div id="content">
            xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
            <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        </div>
    </div>
</div>
The problem I'm having is that the width of <div id="content"></div> cannot be known beforehand in my case, that's why I need to set it to auto.
In that case, the scrollbars are still hidden and the scrolling still works but there is one small "glitch" :
If you scroll all the way to the right, you'll notice that the last bit of <div id="content"></div> is cut off. 
More specifically, the width of the part of <div id="content"></div> that is hidden on the right is equal to the width of the right padding applied to <div id="scroller"></div>. This is very weird.
Why is that and how do I work around that?
Thanks in advance for any help!