The same CSS styles appear distinct when applied in Angular

I'm currently in the process of rewriting a page using Angular. I've successfully copied over all the styles and layout from the original page, but for some reason the colors aren't being applied correctly. After comparing the original and new pages, I can't seem to pinpoint what's causing the discrepancy. I suspect it might be due to CSS specificity or the way Angular handles style encapsulation. Could you please lend me a hand?

Below are the styles that I've copied exactly as they were:

.table-main {
    display: flex;
    flex-direction: column;
    margin-right: -1px;
    overflow-x: scroll;
    overflow-y: hidden;

    .main-head {
        display: flex;

        .head-inner {
            display: flex;
            flex-direction: column;
        }

        .table-col {
            background-color: white;
            cursor: pointer;
        }
    }

    .table-col {
        height: 45px;
        padding: 0 5px;
        border-bottom: 1px solid gainsboro;

        &.locked {
            background-color: darkkhaki;
        }
    }

https://i.sstatic.net/vlrai.png

Answer №1

In Angular, there are two factors that can impact styles: 1 - The presence of component tags in the resulting HTML, which may cause selectors with ">" like ".parent > .child" to break. 2 - Style encapsulation, likely the root of your issues. All CSS selectors become more complex (additional attributes are added to each selector), preventing CSS from affecting elements outside the component's template.

The issue on your screens is due to these extensive selectors having increased specificity, making color #fff appear stronger as a result.

I recommend two options:

1 - Disable style encapsulation

@Component({
  ...
  encapsulation: ViewEncapsulation.None,
}) 

or 2 - Simplify and streamline style selectors

.table-main {
    display: flex;
    flex-direction: column;
    margin-right: -1px;
    overflow-x: scroll;
    overflow-y: hidden;
}
.table-col {
    height: 45px;
    padding: 0 5px;
    border-bottom: 1px solid gainsboro;

    &.locked {
      background-color: darkkhaki;
    }
}

This approach ensures selectors do not excessively increase in size. Some adjustments may still be necessary based on your current CSS structure, but they will be far less significant than under the current circumstances.

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