#container
{
width: 100%;
height: 500px;
position: relative;
}

#bottom-right
{
right: 0;
bottom: 0;
position: absolute;
}

#bottom-left
{
left: 0;
bottom: 0;
position: absolute;
}

#top-left
{
left: 0;
top: 0;
position: absolute;
}