style.css

body {
  margin: 0;
  background: #0b0e14;
  color: #00ffcc;
  font-family: monospace;
}

header {
  text-align: center;
  padding: 1em;
  border-bottom: 1px solid #003333;
}

.equation {
  opacity: 0.7;
}

.container {
  display: flex;
  flex-wrap: wrap;
}

svg {
  flex: 1 1 60%;
  min-height: 450px;
  border-right: 1px solid #003333;
}

.panel {
  flex: 1 1 40%;
  padding: 1em;
}

input {
  width: 100%;
  padding: 0.6em;
  background: #001111;
  color: #00ffcc;
  border: 1px solid #00ffcc;
}

.log {
  margin-top: 1em;
  background: #000;
  height: 260px;
  overflow-y: auto;
  padding: 0.5em;
  border: 1px solid #003333;
}