JSFiddle - React, Tailwind, and code Playground

HTML

<div class="siteContent">
    <img class="debug" src="http://t0.gstatic.com/images?q=tbn:ANd9GcRzjvZihxljFMlEt_IOypeOWYCgPgEvVrZ_DnwVTws5uR_iC_oFIg" /> 
    <span>
        aaa
    </span>
    <br class="clear" />
</div>

CSS

.siteContent
{   
    width: 300px;
    height: 213px;
    margin-left: auto;
    margin-right: auto;
    border: thin solid;
    overflow:hidden;
}
.debug
{
    border: thin solid;
}