Padding and element width- with box sizing

This div 300px wide,

The width of this div remains at 300p, in spite of the 50px of total left and right padding, because of the box sizing: border-box property.

The @keyframes Rule

This div element has a top margin of 100px, a right margin of 150px, a bottom margin of 100px, and a left margin of 80px,

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