The impact of CSS positioning relative on the height of an element

I need help with positioning elements in my HTML layout. I have one element stacked below another and am using relative positioning to nudge the bottom element up slightly so that it overlaps the top element.

The paperOverlay element is positioned at the bottom of the page, but due to the relative positioning, there is some unwanted space left at the bottom. Is there a way to prevent this whitespace?

Here's how the HTML code looks:

<div class="container">
    <div class="homePage">
        <!-- content goes here -->
    </div>
    <div class="paperOverlay" style="position: relative; top: -70px;">
        <!-- more content goes here -->
    </div>
</div>

And here is the corresponding CSS:

.container { 
    width: 960px;
    margin: 0 auto;
}

.homePage { 
    width: 800px;
    height: 500px;
}

.paperOverlay {
    width: 960px;
    min-height: 400px;
    background: url('Images/Overlay.png') no-repeat top center;
}

In essence, I want the torn paper edge effect of the overlay element to slightly overlap the bottom of the element above it. While setting margin-top: -70px helped fix the height issue, it resulted in the top element's contents overlapping the overlay. How can I ensure that the overlay remains on top?

Answer №1

Have you considered using a negative margin instead of relative positioning? Additionally, could you provide further context on why this approach is necessary and share your CSS code for more tailored advice?

Answer №2

To adjust the display properly, consider modifying the height of the paperOverlay element. Ensure it is set to the total height minus the relative offset.

Answer №3

After attempting margin-top: -70px as recommended earlier to adjust the height, I encountered an issue where the elements within the top element were overlaying on top of the overlay itself. Ideally, I want the overlay to appear on top.

Consider the following solution:

div.container 
{ 
    margin: 0 auto;
    width: 960px;
}

div.homePage 
{ 
    height: 500px;
    position: relative;
    width: 800px;
    z-index: 1;
}

div.paperOverlay
{
    background: url('Images/Overlay.png') no-repeat top center;        
    min-height: 400px;
    position: relative;
    top: -70px;
    /* you can optionally use bottom: 70px; rather than top: -70px */
    width: 960px;
    z-index: 2;
}

By applying position: relative; to both elements and setting the z-index appropriately, the overlay should be displayed on top of the top element, resolving the issue.

Additionally, utilizing display: block; on elements requiring fixed width/height can prevent collapsing and ensure proper resizing of non-block-level elements to fit their contents, while adhering to width and height rules.

Answer №4

After experimenting, I found success using the "vh" unit instead of trying height: calc(100%-50px)

#sidebar-nav {

    width: 45px;
    background-color: #ffffff;

    transition: 400ms;
    height: calc(100vh - 50px);
}

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