Is the order of elements in a CSS file important?

In my situation, I am dealing with a nested list and enclosing div that was created by Drupal's menu system, so I am unable to modify it.

My goal is to replicate the menu from a hardcoded website (link removed).

How can I include the sub-items (ul li ul li) in the submenu? Can this be done easily using just a list in block display? Do I need to use z-index or float properties? If so, can we apply float to list items?

Although I grasp the concept of cascading styles, I still find it challenging to write CSS without repeating myself. Any tips on how to shorten my code would be greatly appreciated.

Currently, my main concern is why the style of the last entry (marked) is being overridden. Could the order of styles in the file be affecting this?

#block-system-main-menu .content {
    font-size: 17px;
    font-weight: bold;
}

#block-system-main-menu div ul li {
    width: 207px;
    margin: 4px 0px;
}

#block-system-main-menu div ul li {
    display: block;
    height: 38px;
    background: url(/sites/all/themes/schott/menuitembg.gif);
}

#block-system-main-menu div ul li .active-trail {
    display: block;
    height: 60px;
    background: url(/sites/all/themes/schott/menuitembg_p.png);
}

div ul li ul li.leaf {   /* both styles are overwritten */
    display: inline-block;
    background: url(/sites/all/themes/schott/subitem_passive.gif);
}

Answer №1

When it comes to CSS, the last rule that is written will be the one that gets applied. However, specificity always takes precedence over cascading.

To learn more about specificity in CSS, check out this article: http://css-tricks.com/specifics-on-css-specificity/

For example,

#block-system-main-menu div ul li .active-trail
is the most specific rule and will override any other conflicting rules.

Answer №2

Absolutely, the sequence of CSS declarations is crucial. Any styles defined after another will take precedence and override the earlier ones. It's also important to note that if you need to modify default styles in any way, make sure to include your custom styles after the defaults (whether they are within the same file or linked externally).

Answer №3

Here is the modified version:

#block-system-main-menu div ul li ul li.leaf {

I'm a bit puzzled by your query, but generally speaking, if you have two rules that are identical, the latter will be enforced. However, if the rules differ in specificity, the more specific one will take precedence.

Edit: Apologies, I see you've already figured it out

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