index.css

div, span, li, ul, h1, html, body {
  box-sizing: border-box;
  font-family: Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
  width: 100%;
}
.canvas {
  background: #efefef;
  height: 100%;
  position: relative;
}

.x-axis {
  background: black;
  height: 1px;
  left: 0;
  position: absolute;
  top: 50%;
  width: 100%;
}

.min, .max {
  position: absolute;
}
.x-axis .max {
  right: 0;
}
.y-axis .max {
  bottom: 0;
}

.y-axis {
  background: black;
  height: 100%;
  left: 50%;
  position: absolute;
  top: 0;
  width: 1px;
}

ul {
  left: 10px;
  position: absolute;
  top: 10px;
}
li {
  background-color: coral;
  border-radius: 50%;
  border: 1px solid maroon;
  display: table-cell;
  font-size: 12px;
  height: 60px;
  left: 0;
  list-style: none;
  padding-top: 20px;
  position: absolute;
  text-align: center;
  top: 0;
  opacity: .8;
  width: 60px;
}

li.frontend {
  background-color: cyan;
}