style.css

body {
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  color: #ccc;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100vh;
  background-color: #000;
  font-weight: 100;
}

canvas {
  margin-top: 16px;
  border-radius: 8px;
  background-color: #fff;
}

.settings {
  width: 800px;
  display: flex;
  font-size: 14px;
  color: #ccc;
  justify-content: center;
  align-items: center;
}

.car-settings {
  width: 3000px;
  margin: 0 8px;
}

.car-title {
  font-size: 16px;
  color: #fff;
  font-weight: 200;
}

.position-setting, .speed-setting, .acceleration-setting {
  display: flex;
  flex-direction: row;
}

.setting-title, .speed-title, .acceleration-title {
  min-width: 140px;
}

input {
  width: 64px;
}

.datas {
  margin-top: 8px;
}

.data-area {
  display: flex;
  margin-top: 2px;
}

.data-title {
  min-width: 216px;
}

.start-btn {
  margin-top: 16px;
  margin-bottom: 8px;
  padding: 4px 12px;
  background-color: white;
  color: #000;
  cursor: pointer;
  transition: 250ms;
  border-radius: 4px;
}

.start-btn:hover {
  background-color: rgba(255, 255, 255, 0.8);
}

img {
  width: 0;
  height: 0;
  display: none;
}

.disclaimer {
  width: 0;
  height: 0;
  display: none;
}