<style>
#foo {
    border: 1px solid red;
    margin-bottom: 25px;
    width: 100px;
    height: 100px;
}
#bar {
    border: 1px solid green;
    margin-bottom: 25px;
    width: 100px;
    height: 100px;
}
#baz {
    border: 1px solid blue;
    width: 100px;
    margin-top: -20px;
    height: 100px;
}
</style>
<div id=foo>foo</div>
<div id=bar>bar</div>
<div id=baz>baz</div>