Is it possible to expand a div element to the full width and height of the window or parent div without altering its position in the DOM using only CSS?
<div id="parent1" class="fullwidth">
<div id="parent2" class="notfullwidth">
<div style="position:absolute">mycontent</div><!-- how can I make this span the entire width of parent1 or overlay parent1? -->
</div>
</div>
Indeed, achieving this effect involves positioning the #parent1 with a relative setting and expanding the absolutely positioned grandchild by adjusting its top, right, bottom, and left properties to 0.
#parent1 {
position: relative;
background-color: gold;
}
#parent2 {
width: 70%;
margin: 0 auto;
min-height: 100px;
border: 1px solid gray;
}
.grand-child {
position: absolute;
top: 0; right: 0; bottom: 0; left: 0;
background-color: rgba(255, 30, 0, .5);
}<div id="parent1" class="fullwidth">
<div id="parent2" class="notfullwidth">
<div class="grand-child">mycontent</div><!-- make this full width of parent1/overlay parent1 -->
</div>
</div>In the case where the parent element lacks a relative position, the child can expand to occupy the full width and height of the window.
#mycontent {
background-color: green;
position: absolute;
width: 100%;
top: 0;
left: 0;
height: 100%;
}
However, if the parent1 element does have a relative position specified, then the child will expand to the maximum width and height of the parent.
#parent1 {
position: relative;
width: 300px;
height: 300px;
}
#mycontent {
background-color: green;
position: absolute;
width: 100%;
top: 0;
left: 0;
height: 100%;
}
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