styles.css

.theme-light,
.theme-dark {
  box-sizing: border-box;
  transition: all 0.15s ease-out;
  padding: 12px;
  min-height: 100vh;
}

.theme-light {
  color: #145269;
  background: #fff;
}

.theme-dark {
  color: #fff;
  background: #0b2935;
}