Example 1

suggest change

It is obvious to assume that the percentage value of margin to margin-left and margin-right would be relative to its parent element.

.parent {
    width : 500px;
    height: 300px;
}

.child {
    width : 100px;
    height: 100px;
    margin-left: 10%;  /* (parentWidth * 10/100) => 50px */
}

But that is not the case, when comes to margin-top and margin-bottom. Both these properties, in percentages, aren't relative to the height of the parent container but to the width of the parent container.

So,

.parent {
    width : 500px;
    height: 300px;
}

.child {
    width : 100px;
    height: 100px;
    margin-left: 10%;  /* (parentWidth * 10/100) => 50px  */
    margin-top: 20%;   /* (parentWidth * 20/100) => 100px */
}

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