Why Does My Scaled Element Shift Off-Center During Web Animation, and How Can I Fix It?

How to Maintain Image Origin during Scale Animation

In web animations, when scaling an element positioned absolutely within another element, the scaled element may shift off-center. This can be observed in cases where a red square, representing the scaled element, moves away from the center (represented by a blue square) during the animation.

Cause of the Issue

The issue arises because the animation's transform property overrides the previous translation transform. This removes the translation that maintains the element's alignment at the center.

Solution

To resolve this, we need to combine the transformations in the same transform property, ensuring the correct order.

@keyframes ripple_large {
  0% {
    transform: translate(-50%, -50%) scale(1);
  }
  75% {
    transform: translate(-50%, -50%) scale(3);
    opacity: 0.4;
  }
  100% {
    transform: translate(-50%, -50%) scale(4);
    opacity: 0;
  }
}

.to-animate {
  transform: translate(-50%, -50%);
}

Explanation

Combining the transformations ensures that the translation is maintained throughout the animation, while the scale transformation is applied on top of it. This allows the element to scale without shifting off-center. The transform-origin property doesn't play a role in this case.

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