Built with blockbuilder.org this is a basic example to get started with development
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<header>
</header>
<style>
p{
font-size:28px;
}
#first-paragraph{
font-size:50px;
}
.fancy{
color: red;
}
</style>
<body>
<div class="fancy">
<p id="first-paragraph" style="color:blue">
this is my text.
</p>
</div>
<p id="second-paragraph">
I'm here for the d3 workshop
</p>
<svg height="100" width="100">
<!-- this is how you comment -->
<!-- lets add a circle -->
<circle cx="50" cy="50" r="50" stroke="black" stroke-width="8" fill="rgb(150, 0, 0)"/>
</svg>
<body>