Add styles for basic positioning

visualizer/static/style.css

+* {
+  box-sizing: border-box;
+}
+
 body {
   font-family: 'Verlag', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
+  margin: 0;
+  text-align: center;
+}
+
+body.embedded #plotter {
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+}
+
+#plotter {
+  align-items: center;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  width: 100%;
+}
+
+#plotter-nav {
+  padding: 8px;
+  width: 100%;
+}
+
+#plotter-nav > a,
+#plotter-nav > span {
+  display: inline-block;
+  margin: 8px;
+  padding: 7px;
+  border: 1px solid black;
+  width: 256px;
+  max-width: calc(100% - 16px);
+}
+
+#controls {
+  width: 100%;
+}
+
+#selections {
+  padding: 8px;
+  width: 100%;
+}
+
+#selections > div {
+  display: inline-block;
+  margin: 8px;
+  width: 224px;
+  max-width: calc(100% - 16px);
+}
+
+#selections label,
+#selections select {
+  display: block;
+  width: 100%;
+}
+
+#plot img {
+  aspect-ratio: 1200 / 600;
+  background: #eee;
+  max-width: 100%;
+  width: 1200px;
 }