Why does grid-gap cause an overflow?
Solution 1
You have a 3-column grid container (.body
):
grid-template-columns: 25% 50% 25%
The total width of those columns is 100%.
You're then adding gutters between the columns (and rows):
grid-gap: 10px
which is shorthand for:
grid-column-gap: 10px;
grid-row-gap: 10px;
So when you add up all the widths you get:
25% + 50% + 25% + 10px + 10px
Put more briefly:
100% + 20px > 100%, which results in an overflow condition
(Note: grid-*-gap
properties apply only between grid items – never between items and the container. That's why we calculate two grid gaps, not four.)
As a solution, instead of percentage units, try using fr
units, which apply only to free space. This means that fr
lengths are calculated after any grid-gap
lengths are applied.
grid-template-columns: 1fr 2fr 1fr
div:not(.header):not(.body):not(.row) {
border: 1px solid grey;
}
.header {
margin-top: 20px;
display: grid;
grid-gap: 10px;
grid-template-areas: "header-left header-right-up" "header-left header-right-down";
grid-template-rows: 40px 40px;
grid-template-columns: minmax(50px, 200px) auto;
}
.header-left {
grid-area: header-left;
}
.header-right-up {
grid-area: header-right-up;
}
.header-right-down {
grid-area: header-right-down;
}
.body {
margin-top: 20px;
display: grid;
grid-template-columns: 1fr 2fr 1fr; /* ADJUSTMENT */
grid-auto-rows: 80px;
grid-gap: 10px;
}
.row-left {}
.row-center {}
.row-right {}
<div class="header">
<div class="header-left">image</div>
<div class="header-right-up">content</div>
<div class="header-right-down">long content</div>
</div>
<div class="body">
<div class="row-left"></div>
<div class="row-center"></div>
<div class="row-right"></div>
<div class="row-left"></div>
<div class="row-center"></div>
<div class="row-right"></div>
<div class="row-left"></div>
<div class="row-center"></div>
<div class="row-right"></div>
</div>
More details here: The difference between percentage and fr units in CSS Grid Layout
Solution 2
If you want to use percentages or some other unit, there is one more solution. The use of the minmax()
function will allow the columns to shrink to fit the parent container and not cause overflow.
The solution would look like this:
grid-template-columns: minmax(auto, 25%) minmax(auto, 50%) minmax(auto, 25%);
gap: 10px;
More on the minmax()
function here.
Solution 3
Late reply but 100% worth it.
Summary from many resources.
- Usage with
%
Grid columns calculated with %
are not taking into accounts gutters (aka gaps). Therefore you need to add the pixels of the added gaps to the calculation. so totalGridWidth = SUM(...%) + gutters = ~100% + gutters
- Usage with
fr
The previous issue does not happen (exception on number 3.) as it includes to calculate the free space as well with the gaps. so calculation is as follow: (free space - gutters) / 12 = 1fr
therefore here you could get ratios as fractions instead of portions as percentages.
Or in other words with the Least Common Divisor (1fr = 25%):
grid-template-columns: 1fr 2fr 1fr;
- Usage with
minmax(0,Xfr)
By default the browser layout engine uses to calculate Xfr
this formula minmax(auto,Xfr)
which relies on the minimum size of your items, and when any of those items or inner elements are expected to grow in size indefinitely with things like width:100%
the auto
parameter will make still case 2. to run sometimes with overflown grids. To prevent this, we need to force the browser to use a method that can shrink the elements until its real minimum, which is 0px
to do this you need to use minmax(0,Xfr)
with X
as the desired fraction.
Or in other words, for your previous case:
grid-template-columns: minmax(0,1fr) minmax(0,2fr) minmax(0,1fr);
I know this might look too verbose, but given your such edge case we cannot use repeat()
here, and in any case, this will be a bulletproof for your overflowing issues.
You can read more in this article I have found:
https://css-tricks.com/preventing-a-grid-blowout/
Damiano Barbati
Updated on June 09, 2022Comments
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Damiano Barbati about 2 years
Why do I have an overflow on the X axis in the following snippet?
The overflow is generated once I apply
grid-gap: 10px
on my.body
grid container.div:not(.header):not(.body):not(.row) { border: 1px solid grey; } .header { margin-top: 20px; display: grid; grid-gap: 10px; grid-template-areas: "header-left header-right-up" "header-left header-right-down"; grid-template-rows: 40px 40px; grid-template-columns: minmax(50px, 200px) auto; } .header-left { grid-area: header-left; } .header-right-up { grid-area: header-right-up; } .header-right-down { grid-area: header-right-down; } .body { margin-top: 20px; display: grid; grid-template-columns: 25% 50% 25%; grid-auto-rows: 80px; grid-gap: 10px; } .row-left { } .row-center { } .row-right { }
<div class="header"> <div class="header-left">image</div> <div class="header-right-up">content</div> <div class="header-right-down">long content</div> </div> <div class="body"> <div class="row-left"></div> <div class="row-center"></div> <div class="row-right"></div> <div class="row-left"></div> <div class="row-center"></div> <div class="row-right"></div> <div class="row-left"></div> <div class="row-center"></div> <div class="row-right"></div> </div> </div>
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CodeGems almost 5 yearsanother important thing to mention is that using fr units will not always equate to having same size of cells e.g. 50% 50% may not always be half/half. it depends on the content that goes inside cells. To prevent overflow of content or cell to expand to fit content you have to use minmax(0, 1fr) trick. more here: css-irl.info/debugging-css-grid-part-2-what-the-fraction
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TylerH over 4 yearsFYI - they've just added
gap
and declaredgrid-gap
is a 'shorthand' ofgap
in the WD of the spec.