CSS Flexbox Generator

Controls

8px
3

Preview & CSS

 
   
 
 
   
 
 
 
How to Use
 
     
  1. Choose direction — Select flex-direction to set the main axis: row (horizontal) or column (vertical).
    2.  
  2. Align main axis — Use justify-content to distribute items along the main axis.
    3.  
  3. Align cross axis — Use align-items to align items perpendicular to the main axis.
    4.  
  4. Control wrapping — Set flex-wrap to allow items to wrap to the next line.
    5.  
  5. Set gap — Drag the gap slider to add space between items.
    6.  
  6. Adjust count — Change the number of items to preview different layouts.
    7.  
 
 
 
What Is CSS Flexbox?
 
Flexbox (Flexible Box Layout) is a CSS layout model designed for one-dimensional layouts — either a row or a column. It makes aligning and distributing space among items straightforward, even when their sizes are dynamic.
 
Use flexbox for navigation bars, card rows, centered content, and any layout where items need to align along a single axis. For two-dimensional grids, CSS Grid is usually more appropriate.
 
 
 
Common Use Cases
 
 
Navigation bars
 
Centered hero sections
 
Card rows
 
Form layouts
 
Footer columns
 
Button groups
 
 
Tips & Best Practices
 
 
 Use gap instead of margin 
gap only adds space between items, not on the outer edges — cleaner than adding margins to every child.
 
 
 flex: 1 for equal widths 
Apply flex: 1 to child items to make them share available space equally without specifying fixed widths.
 
 
 min-width: 0 on children 
Flex items have a default minimum size based on content. Setting min-width: 0 allows text truncation and overflow to work correctly inside flex items.
 
 
 Flexbox vs Grid 
Flexbox excels at one-dimensional layouts (a row or a column). Use CSS Grid when you need to control both rows and columns simultaneously.
 
 
 
Frequently Asked Questions
 
 
What is the difference between justify-content and align-items?
 
justify-content aligns items along the main axis (horizontal in a row, vertical in a column). align-items aligns them along the cross axis (perpendicular to the main axis).
 
 
 
When should I use flex-wrap: wrap?
 
Use flex-wrap: wrap when you want items to flow to a new line if they don't fit in a single row. This creates responsive layouts without media queries.
 
 
 
How do I center an element both vertically and horizontally with flexbox?
 
Set the container to display: flex; justify-content: center; align-items: center; and it will center its children in both axes.
 
 
 
What does flex-direction: column do?
 
It switches the main axis to vertical, so items stack top to bottom instead of left to right. justify-content then controls vertical distribution, and align-items controls horizontal alignment.