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Do not mix styles of an element with its container

Written byPhuoc Nguyen
12 May, 2021
When developing a reusable component, we should follow the rule: the component should look like the same regardless where it's placed.
For example, the `margin` style in the following CSS is used for a specific use case where we want to have a space between `.item` and its sibling element.
.item {
margin: 1rem 0;

/* Other styles */
It isn't recommended because it could be broken when you use `item` in another container. Instead, you should use a wrapper to separate the styles of element and its container:
.item-wrapper {
margin: 1rem 0;
The `item` class can be reused in different places without breaking the look and feel:
<div class="item-wrapper">
<div class="item">...</div>

<!-- Used in another wrapper -->
<div class="other-wrapper">
<div class="item">...</div>

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Phước Nguyễn