:root {
  --theme1-bg: #0088CC;
  --theme1-bg90: #0088CCE6;
  --theme2-bg: #2C3E50;
  --theme2-bg70: #2C3E50;
  --theme2-bg85: #2C3E50;
  --primary-color: #fff;
  --secondary-color: #fff;
}
html, body{
  background-image: linear-gradient(var(--theme1-bg), var(--theme2-bg));
}