Bootstrap seems easy to use:
Add this to your .html file.
<div class="row">
<div class="col-md-6" id="area1"></div>
<div class="col-md-6" id="area2"></div>
</div>
Take the d3 object in select () to the id in the div tag.
var chart2 = d3.select("#area1").append("svg")
...
var chart2 = d3.select("#area2").append("svg")
...
For more details, just follow the examples in the D3-Tips-and-Tricks book. Section: Using Bootstrap with d3.js
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