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<div class="relative">
    xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx<br/>xxxxx

    <div class="absolute"></div>
</div>

.relative {
    position:relative;
    width:100px;
    background-color:#6E919A;
}
.absolute {
    position:absolute; top:10px; bottom:20px; left:10px;
    width:30px;
    background-color:#9BC9D1;
}