3.3 margin convention

<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>

<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">

<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family: 'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 0px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining element stylings*/

rect {
  fill:#28f039;
  stroke:#8ff798;
  stroke-width:1.5;
  fill-opacity:0.1;
  stroke-opacity:1;
}

text {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:12px;
  fill:#8ff798;
}

</style>
</head>

<body>

<p id="h1">MARGIN CONVENTION</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>
  
<script>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 700 - m.left - m.right,
    h = 700 - m.top - m.bottom;

//Container
var svg = d3.select("body")
	  .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
		.attr("transform", `translate(${m.left}, ${m.top})`);

//Add a rect to make the svg visisble
svg.append("rect")
    .attr("width", w)
    .attr("height", h);

//Add some text
svg.append("text")
    .text("CHART CONTAINER")
    .attr("y", -8)
	  .attr("x", 4);

</script>
 </body>
 </html>

https://d3js.org/d3.v3.min.js