CSS 网格与 SVG 背景

Question

I am using CSS Grid, which works great, but want to have a background SVG that the grid sits on top of.

For example, here is the HTML:

<div className="wrapper">
    <div className="item">
        <div id="wave">
            <svg viewBox="0 0 500 200" preserveAspectRatio="none"><path d="M0.00,92.27 C216.83,192.92 304.30,8.39 500.00,109.03 L500.00,0.00 L0.00,0.00 Z"></path></svg>
        </div>
    </div>
    <div className="item">1</div>
    <div className="item">2</div>
    <div className="item">3</div>
</div>

...and the CSS:

.wrapper {
    display: grid;
    grid-template-rows: 100px 100px 100px 100px;
    grid-template-columns: 100vw;
    gap: 10px;
    width: 100vw;
    height: auto;
}

.item {
    background: rgba(0, 0, 0, 0.5);
}

...which obviously only places the SVG in the top row. How can I sit the SVG behind the grid? I also tried wrapping the wrapper with a div and seeing the position to absolute.

Should look like this (svg wave in blue, grid items in pink):

Answer 1

Using the wrapper approach:

1. Create a wrapper element with position: relative .
2. Add the svg element with position: absolute and top: 0 , right: 0 , etc...
3. Add the grid element with position: relative .

The wrapper having position: relative allows the svg to size itself using the wrapper as its parent. The position: relative on the grid creates a new stacking context above the svg which also has its own stacking context thanks to position: absolute .

Here's a demo:

 .wrapper { position: relative; }.wrapper svg { position: absolute; top: 0; right: 0; bottom: 0; left: 0; fill: lightblue; }.grid { display: grid; grid-template-rows: 100px 100px 100px 100px; grid-template-columns: 100%; border: 1px solid black; gap: 10px; position: relative; }.item { background-color: rgba(0, 0, 0, 0.5); }

 <div class="wrapper"> <svg viewBox="0 0 500 200" preserveAspectRatio="none"> <path d="M0.00,92.27 C216.83,192.92 304.30,8.39 500.00,109.03 L500.00,0.00 L0.00,0.00 Z"></path> </svg> <div class="grid"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> </div> </div>

Answer 2

A lot less HTML and CSS when you place your SVG in the .grid background

Convert your SVG to CSS in: https://yoksel.github.io/url-encoder/

Only drawback: You can't style the SVG with CSS, you have to fill the SVG path with an attribute.

 .grid { display: grid; grid-template-rows: repeat(3,50px); grid-template-columns: 100%; border: 1px solid black; gap: 10px; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 500 200'%3E%3Cpath fill='lightblue' d='M0 92C217 193 304 8 500 109L500 0 0 0Z'%3E%3C/path%3E%3C/svg%3E"); background-size: cover; }.item { background-color: rgba(0, 0, 0, 0.5); }

 <div class="grid"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> </div>