Center align content vertically and horizontally in CSS

Center aligning content vertically and horizontally are usual requirement in any website. There are several ways to achieve it using CSS.

• using CSS transform
• using flexbox

CSS transform

.content {
  position: relative;
  top: 50%;
  left: 50%;
  // shifts or translate the center point (X, Y) by (X - 50% of outerWidth, Y - 50% of outerHeight)
  transform: translate(-50%, -50%);
}

https://codepen.io/Param-Harrison/pen/ErPyva

Limitations

• It works very well for centering content block with fixed width in both directions ✅
• For non fixed width, the content block assumes 100% of parent's width. It expands the whole width of parent container horizontally. You can check this by removing width for content in codepen example ❌
• this technique won't work if the content is inline level element, it only works for block level elements ❌

Modern flexbox way

.parent {
  display: flex;
  // centering along main axis - X axis - Horizontal
  justify-content: center;
  // centering along cross axis - Y axis - Vertical
  align-items: center;
}

https://codepen.io/Param-Harrison/pen/ZwQBxR

Note: main and cross axis depends on flex-direction property. By default flex-direction is row. If it is set as column, then main axis is Y and cross axis is X.

This approach works on almost every use cases perfectly

• fixed width of content block ✅
• non fixed width of content block ✅
• content can be inline level element or block level element ✅

Flexbox is so powerful and you can easily develop more styles and components using it. Its supported on all major browsers, no excuse to not using it 😊