Vertical-align with Bootstrap 3

Flexbox: Cosplaying Old Methods

Flexbox, the ultimate layout hero versus traditional, less flexible methods for vertical alignment, truly steals the show. Who needs margin-top or vertical-align when you've got flex on your side?

Vintage flavors: The not-so-heroic side

Inline-block Busters:

Get along, inline-block with vertical-align method, not without its whitespace tantrums. HTML comments (<!-- -->) to the rescue!

Absolute Positioning Misfires:

Even absolute positioning coupled with the dynamic duo transform: translateY(-50%) and top: 50% falls short when the parent's height remains a mystery. Quite the plot twist.

Flexbox wins the crown

Opposite to these constraints stands Flexbox. With display: flex; and align-items: center; inside the .center-vertically class, vertical centering transforms from nerve-racking cliffhanger to satisfying season finale.

The importance of a supportive parent

For Flexbox to do its magic, a supportive parent container with a defined height is crucial:

.container-full-height {
  height: 100vh; /* Full-on viewport chills */
}


Or the bare minimum to keep the drama alive:

.container-min-height {
  min-height: 100vh; /* Minimum but mighty */
}


Adding one of these to your .container keeps the vertical alignment's plot consistent across the multitude of screen sizes and content lengths.

Responsiveness: Not a cliffhanger but a Flex-Feature

In the land of web development, responsiveness is the true king, and Bootstrap's flex utilities are its knights. How, you ask?

Media Queries: The Royal Decree

Make use of media queries with Flexbox properties to suit the courses of different screen sizes. Democracy in action!

Responsive Footmen at Your Service:

Charm your application with custom responsive helper classes. Is vertical centring only needed on medium devices or larger?

@media (min-width: 768px) {
  .center-vertically-md {
    display: flex; /* Flexible estates */
    align-items: center; /* Mid-level rise */
  }
}


New Season, New Features: Meet Bootstrap 4

Fancy an upgrade? Bootstrap 4 enters the narrative with Flexbox as the default mode, including the showstopper align-self-center for an effortlessly vertical alignment scene.

Props, Tricks, and Behind-the-Scenes Snippets

Subpixel Rendering: Director’s Cut

Keep your eyes on subpixel rendering to ensure precise positioning. Zooms and varying resolutions can disrupt the crafted pixels.

Cross-browser Compatibility: The Casting Couch

Autoprefixer ensures your flex layers are browser-friendly. IE10 and older audiences may find Flexbox a tough script to follow.

HTML Reviews

Unwanted spaces aren’t great for timings. HTML comments lend a helping hand when dealing with inline elements or display: inline-block;.

Accessibility Critics

Remember your wide-ranging user base. Vertically centered contents must remain navigable and comprehensible, even for those depending on screen readers or keyboard navigation.