Css Programming Tutorials, Guides & Best Practices

:root {
    --primary-color: #3498db;
    --background-color: #ffffff;
    --text-color: #333333;
}

.dark-theme {
    --primary-color: #1abc9c;
    --background-color: #2c3e50;
    --text-color: #ecf0f1;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
}

.button {
    background-color: var(--primary-color);
}

When the .dark-theme class is added to the body, it overrides the variables, and the entire theme changes dynamically.

• Using Flexbox for Grid-Like Layouts without CSS Grid
• Aligning Content within Grid Items

• Creating Multi-Level Responsive Layouts with Nested Flex Containers

.flex-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 200px;
}

.flex-item {
  background-color: lightgreen;
  padding: 10px;
  border: 1px solid #ccc;
}

• Main Axis: The primary axis along which flex items are laid out (horizontal by default).
• Cross Axis: The axis perpendicular to the main axis (vertical by default).