<p dir="auto">I can't found DatePicker after install material-ui</p>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/callemall/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<p dir="auto">I'm using Material-ui for web _ ver 1.0.0-beta.4</p>
<p dir="auto"><a href="https://codesandbox.io/s/vy79r048z5" rel="nofollow">Here</a> small button is small.<br>
But <a href="https://codesandbox.io/s/rw1mky9prp" rel="nofollow">here</a> it looks like a medium size button.</p>

<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/mui-org/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h2 dir="auto">Expected Behavior</h2>
<p dir="auto">Button with size="small" looks smaller then medium size button, independently by content inside.</p>
<h2 dir="auto">Current Behavior</h2>
<p dir="auto">It looks almost like medium size button.</p>