How do you manage your styles with CSS variables?

CSS variables, known as Custom Properties, let you store values like colors or sizes. You create them with '--' and use them in your CSS. They're handy because you can change one value, and it updates everywhere it's used, making your code easier to manage and customize.

CSS variables are placeholders for values that you can reuse throughout your CSS style sheet, such as colors, fonts, sizes, or margins. The idea here is that if you want to change for example the color that is used a lot throughout your style sheet you can change it by changing the variable value of that color just one time!

create variable with local or global scope --css_variable_name: css property value; use the var() Function for set css property: var(--css- _variable_name);

/* Define a custom property for text color */ :root { --text-color: #333; } /* Use the custom property for text color */ p { color: var(--text-color); }

CSS variables can be modified dynamically with JavaScript, which makes it possible to change styles on the fly based on user interactions or other conditions.

Start with `:root` to declare global variables. Use `--` followed by your variable name. Assign values to your variables. End each declaration with a semicolon (;). :root { --primary-color: #007bff; --font-size: 16px; }

Here is an example to declare four colors variables: :root { --main-white:#f0f0f0; --main-red:#c41547; --main-gray:#bfbdbd; --main-black:#363535; }

CSS Variables, also termed Custom Properties, let you set and reuse specific values throughout your stylesheet. Define them in a selector, usually :root for global access. Use them elsewhere using the var() function. Benefits include centralized value management, dynamic updating with JavaScript, and the ability to scope values to specific selectors.

In CSS, you can declare variables using custom properties, also known as CSS variables. These variables allow you to store and reuse values throughout your stylesheet, making it easier to maintain and update your styles. To declare a CSS variable, you use the -- prefix followed by a custom name. Variable names are case-sensitive and can consist of letters, numbers, hyphens, and underscores. Here's the basic syntax: --variable-name: value; For example: --primary-color: #007bff;

To use CSS variables for managing your styles, you would first define the variables in your CSS file like this: :root { --primary-color: #007bff; --secondary-color: #6c757d; --border-radius: 4px; }

You can use it like this: .nav-bar { background-color: var(--main-black); color: white; } In this example we made the nav bar background color our custom black and the text font color the default white.

I want to add another technique that I use. Its HTML inline CSS variable declaration, it goes like: <span class="card" style="--servicebox-color:#EEE" ><\span> This will help to make multiple card spans with different backgrounds defined in HTML also it helps in Javascript DOM manipulation. You can set background image, color, font style on an event rather than writing a whole block of CSS from JS

Reference Variable: In your CSS, use var() followed by the variable name. Fallback Value (Optional): You can set a fallback value in case the variable is undefined. :root { --primary-color: #007bff; --font-size: 16px; } body { background-color: var(--primary-color); font-size: var(--font-size); } p { color: var(--text-color, #333); /* Fallback to #333 if undefined */ }

The statemement is true, in addition css variables not only takes color but it can help with size measurements like --box-height: 50px. So using css variables help us when you want to use the same measument in many places by changing one css variable value it takes effect to other places whithout editing manually.

Understanding some nuances of CSS variables: they're incredibly useful in functions like calc and filter, yet there's a limitation when it comes to using them directly in media queries: @media (min-width: var(--breakpoint)) { /* This won't work */ } Media queries require constant values for their conditions. You cannot use a variable to change the conditions of a media query, but you can use a media query to change the value of a variable: :root { --font-size: 14px } @media (min-width: 960px) { :root { --font-size: 16px } }

Select the element to update. Use JavaScript to set the new value using style.setProperty(). const root = document.documentElement; root.style.setProperty('--primary-color', '#fffff');

To change CSS variables you can use JavaScript to dynamically update their values or define different values for different elements or states. For example: document.documentElement.style.setProperty('--main-color', '#ff5733'); Replace '--main-color' and '#ff5733' with your variable name and desired value.

You can also add your own unique color palette using CSS color codes. Such as color text and color highlights. For example:- --color-text: #333; --color-highlight: #fb0000;

Group by Purpose: Organize variables based on what they control, like colors or layout. Use Comments: Add comments to explain each group's purpose. Order Logically: Arrange variables in a logical order, e.g., layout, typography, colors. Clear Names: Give variables meaningful names, like "--primary-color." Separate Global and Component-Specific: Keep global variables separate from those specific to components. Group Media Queries: If using variables in media queries, group them by breakpoints for clarity.

Proper organization makes it easier to manage and update your styles, encourages consistency, and improves collaboration with other developers. Here are some best practices for organizing CSS variables 1. Use meaningful names. 2. Group related variables. 3. Use comments for documentation. 4. Separate global and component-specific variables. 5. Create a variables file. 6. Use consistent naming conventions. 7. Consider variable defaults. 8. Avoid excessive nesting.

To create a cohesive project design, study your needs and plan CSS variables carefully. Find common properties like colors, spacing, fonts, and breakpoints. Use CSS variables to maintain a unified brand identity without overwhelming your stylesheet. They provide dynamic management, simplifying code and adapting to changes. This approach guarantees a consistent, adaptable design that reflects your brand identity across the entire project.

One standout feature of CSS variables, absent in other frameworks like Sass, is the ability to dynamically change variable values during runtime. This flexibility opens up possibilities such as seamlessly switching themes by applying a class at the top level, where variable values can be modified. It also allows for adjusting values within media queries, enabling the creation of responsive CSS variables.

If your using SASS or SCSS, you can make a global variable folder to store your css variables. E.g _variables.scss Then add variable like this $primaryColor: #000; You can import the compiled variables.css file in any folder you would like to use it. E.g @import '../variables.css' Then use background-color: $primaryColor;

CSS variables can also be used to create themeable styles, where you define a set of variables for each theme and switch between them using JavaScript.