Which specific CSS rule is responsible for the issue I am currently experiencing?

I have styled a left-hand border on items in a list, with the border-left-color set to transparent for all of them. The active item, marked by the css class "active day", has a specific color for its border. Below is a snippet of the code (certain styles have been omitted):

<!-- example.html -->

<div id="day-sidebar">
    <div class="active-day">
        <h2>19</h2>
        <p>Fri</p>
    </div>                
    <div>
        <h2>20</h2>
        <p>Sat</p>
    </div>                
    <div>
        <h2>21</h2>
        <p>Sun</p>
    </div>                
</div>
/* example.css */

#day-sidebar div {
    border-left-width: 15px;
    border-left-style: solid;
    border-left-color: transparent;
}

.active-day {
    border-left-color: red;
}

According to my understanding:

  • Classes have higher specificity than tags
  • In a CSS file, rules that appear later take precedence over rules that appear earlier

However, the first div in this example does not display the new border color for active-day. Is there a reason for this?

Note: Adding !important to the CSS makes it work, but I am aware that this is recommended as a last resort.

Answer №1

After some troubleshooting, I have finally identified the issue at hand! It turns out that my CSS rule targeting divs is being overridden by an HTML id selector for the parent element, as IDs take precedence over classes. To resolve this conflict, I can assign a class of "day" to each div like this:

<!-- updated-example.html -->

<div id="day-sidebar">
    <div class="day active-day">
        <h2>19</h2>
        <p>Fri</p>
    </div>                
    <div class="day">
        <h2>20</h2>
        <p>Sat</p>
    </div>                
    <div class="day">
        <h2>21</h2>
        <p>Sun</p>
    </div>                
</div>
/* updated-example.css */

.day {
    border-left-width: 15px;
    border-left-style: solid;
    border-left-color: transparent;
}

.active-day {
    border-left-color: red;
}

Answer №2

When specifying the following:

#day-sidebar div {
    border-left-width: 15px;
    border-left-style: solid;
    border-left-color: transparent;
}

These styles will take precedence over just using .active-day due to more selectors being present, resulting in higher priority. Additionally, an id holds a higher priority than a class.

To address this issue, you can implement the following solution:

.active-day {
    border-left-color: red !important;
}

However, it is advisable (as I recommend and urge you) to handle it like this instead:

#day-sidebar .active-day {
    border-left-color: red;
}

Avoid using !important unless absolutely necessary.

Feel free to reach out if you need further assistance :)

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