This seems close to what you want:
#foo {_x000D_
background: red;_x000D_
max-height: 100px;_x000D_
overflow-y: hidden;_x000D_
}_x000D_
_x000D_
.bar {_x000D_
background: blue;_x000D_
width: 100px;_x000D_
height: 100px;_x000D_
float: left;_x000D_
margin: 1em;_x000D_
}
_x000D_
<div id="foo">_x000D_
<div class="bar"></div>_x000D_
<div class="bar"></div>_x000D_
<div class="bar"></div>_x000D_
<div class="bar"></div>_x000D_
<div class="bar"></div>_x000D_
<div class="bar"></div>_x000D_
</div>
_x000D_