HTML：

<div class="Box1">Howdy.</div>
<div class="Box2">Howdy.</div>
<div class="Box3">Howdy.</div>​

CSS：

.Box1 {
    width: 140px;
    height: 140px;
    background: #f66;
}

.Box2 {
    width: 140px;
    height: 140px;
    background: #66f;
    padding: 1em;
}

.Box3 {
    width: 140px;
    height: 140px;
    background: #6f6;
    border: 1em solid #000;
}

小提琴：http://jsfiddle.net/Wrc5S/