如何用CSS居中max-width为1060px的盒子元素？选择器存疑求助

Hey Pascal, sorry to hear you're stuck trying to center that upsell item—let's work through this step by step.

First, let's break down why your current CSS might not be working:

• The align-self property only works on flex child elements, so if the parent container (.ls-ul) isn't set to display: flex, this rule won't do anything at all.
• Even if it is a flex container, your selector might not have enough specificity to override the plugin's default styles, or there could be conflicting properties like float or position on the li.ls-show element that are blocking centering.

Here are a few targeted fixes to try:

1. Ensure the Parent Container Uses Flex Layout #

First, check if the .ls-ul parent is a flex container. If not, add this to your CSS to enable flex behavior:

.ls-recommendation-box[data-box-type="Upsell"] .ls-ul {
  display: flex;
  flex-wrap: wrap; /* Keep this if you want items to wrap on smaller screens */
  justify-content: center; /* This will center all child items horizontally in the flex container */
}

If you use justify-content: center on the parent, you might not even need the align-self rule on the child—this is often a simpler approach for horizontal centering.

2. Fix the Child Element's Styles #

If you still need to target the individual li.ls-show element, try this more robust rule that resets any conflicting defaults and ensures centering:

.ls-recommendation-box[data-box-type="Upsell"] .ls-ul li.ls-show {
  align-self: center !important; /* For vertical centering in flex */
  margin: 0 auto !important; /* For horizontal centering (works even if not flex) */
  float: none !important; /* Reset any float that might be pushing it off-center */
  position: static !important; /* Override any absolute positioning */
}

3. Verify Selector Specificity with Dev Tools #

A quick way to debug this is to use your browser's Dev Tools (F12 key):

• Navigate to the Elements tab, find the li.ls-show element in the DOM
• Check the Styles panel to see if your custom CSS is being applied (look for your rule—if it's crossed out, it's being overridden by a more specific selector)
• If it's not showing up at all, double-check that your selector matches the exact structure of the DOM (sometimes plugins add extra classes or nested elements you might have missed)

Give these steps a shot—they should help you get that upsell box centered properly!

内容的提问来源于stack exchange，提问作者Pascal