styles.css

:root {
  --features-table-width: 350px;
}

body {
  font-family: sans-serif;
}

main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#controls {
  display: flex;
  gap: 2rem;
}

label {
  display: flex;
  gap: 1rem;
}

#output {
  display: flex;
  overflow: hidden;
}

#output > div {
  width: 0;
  transition: width 0.2s ease;
  overflow-y: auto;
  height: 100%;
}

#output.show-table > div {
  width: var(--features-table-width);
}

#image {
  display: grid;
  grid-template-columns: auto;
  grid-template-rows: auto;
  max-width: 100%;
  position: relative;
  width: var(--image-full-width);
  transition: width 0.2s ease;
}

#output.show-table #image {
  width: calc(var(--image-full-width) - var(--features-table-width));
}

img {
  width: inherit;
}

#output,
svg {
  height: calc(var(--image-full-width) * var(--image-aspect-ratio));
}

svg {
  position: absolute;
  transition: height 0.2s ease;
  width: inherit;
}

#output.show-table,
#output.show-table svg {
  height: calc(
    (var(--image-full-width) - var(--features-table-width)) *
      var(--image-aspect-ratio)
  );
}

svg path {
  fill: transparent;
  stroke: #44f8;
}

svg path.marked {
  opacity: 0.6;
  stroke: lime;
}

svg path.active,
svg path:hover {
  opacity: 1;
  stroke: hotpink;
}

table {
  border-collapse: collapse;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

table th,
table td {
  min-width: 5rem;
  padding: 0.5rem;
  text-align: left;
}

table th {
  background-color: #444;
  color: #fff;
  font-weight: bold;
  text-transform: uppercase;
}

table tr:nth-child(even) td {
  background-color: #f2f2f2;
}

table tr:hover td {
  background-color: #ffedcc;
}