My hover popup is positioned absolutely with a left value of 50%. Despite this, it does not appear in the center of the page as expected when hovering over the "ice white" image. Can anyone offer suggestions on how to fix this issue? Thank you in advance.
It's important to remember to include margin-left as the negative half of the visible width of the element. Here is an example:
width: 600px;
padding: 20px;
border-width: 3px;
/* -(600 + 20 + 3)/2 = -312 */
margin-left: -312px;
left: 50%;
Keep in mind that using margin: auto as suggested by others will not be effective when the element is positioned absolutely.
display: flex;
justify-content: center;
align-items: center;
Ha ha, negative on that one. The right side of the picture shows up at 50% of the page width. So, you'd use right: 50%.
If you want to center your image, just go with margin: auto instead.
Great news! Your code is functioning as expected. The popup's positioning is based on the left side of the TD element it is contained within.
If you're encountering issues, consider removing the popup from the table or adjusting its positioning to be 50% of the overall document width instead. Unfortunately, I am unable to provide further assistance with your minified and unreadable JavaScript code.
Consider modifying the CSS Style in this manner
#displayDiv {
background-color: white;
font-weight: bold;
height: 460px;
left: 50%;
margin: auto auto auto -475px;/* changes made here */
overflow: hidden;
position: absolute;
text-align: center;
top: 80px;
width: 950px;
z-index: 1;
}
It appears that there is a containing element between the "Ice White" image and the body (specifically, Firebug identifies it as the <a class="popup1" ... >) which is relatively positioned. This means that your 50% calculation is relative to that specific element rather than the entire page.
This may seem counterintuitive - why should it be relative to a parent element if the popup itself uses absolute positioning? The reason lies in how relative positioning functions in relation to the normal flow of the document, whereas absolute positioning removes the element from that flow. For further information, refer to sections 9.4.3 and 9.6 of the W3C's visual formatting model explanation.
If you're finding this issue challenging, consider checking out tutorials such as "Learn CSS Positioning in Ten Steps" or css-tricks.com's article on "Absolute Positioning Inside Relative Positioning." As for addressing this problem, while you could try moving the popups outside of the relatively positioned parent as mblaze75 suggests, it seems like the <a> element is triggering your JavaScript event, making this solution impractical. Instead, experiment with removing the relative positioning and using margins instead.
Additionally, keep in mind Greg Agnew's point about centering the left edge rather than the center of your popup. duri's answer might provide a solution for that aspect of the issue.
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