styles.css

html,
body {
  margin: 0;
  padding: 0;
  background: rgb(194,124,217);
  background: linear-gradient(0deg, rgba(194,124,217,1) 0%, rgba(28,173,203,1) 56%, rgba(71,203,130,1) 100%); 
  height: 100vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "Source Code Pro", monospace;
  font-optical-sizing: auto;
  font-style: normal;
}
canvas {
  display: block;
  margin: 20px;
  border: 10px solid #333;
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgba(254, 254, 254, 0.60);
  max-width: 1000px;
  min-height: 600px;
  flex-basis: 1000px;
  flex-shrink: 1;
  flex-grow: 0;
  flex-wrap: wrap;
}
.content {
  max-width: 300px;
  flex: 1;
  padding: 20px;
  flex-basis: 300px;
}
.speed-slider-container {
  display: flex;
}
span#speed {
  margin-left: 10px;
  text-align: right;
}