0 days without mistake with SVG background

TLDR

If you have SVG with defined width on it, for using as background you either need to set background-size: 100% 150px (second value is a height, put there what works for you) or background-size: auto 150px + background-repeat: repeat-x;

Codesandbox with examples how SVGs look with different css options.

We have a background SVG at the top of our website: it is SVG image on top, but the main part is just a gray background.

We use the following css for that:

.container {
    background-image: url(path/to/our.svg);
    background-repeat: no-repeat;
    background-size: 100% 144px;
}

It works fine, but holidays are coming and our designer suggested to use a more festive background (and of course add little snow, but there was no problem with snow). Additionally designer requested not to stretch holiday image, so I came up with the following css

.container {
    background-image: url(path/to/holiday.svg);
    background: no-repeat;
    background-size: auto 144px;
    background-position: left top;
}

It went to testing, then to production, and a couple of days after I have message from colleague: hey, could we do something with holiday background on wide screens? It was a disaster: on wide screens (more than 2500px) our background ends on 2000px and the rest is left as an empty gray space!

Fix is really simple:

.container {
    background-image: url(path/to/holiday.svg);
    background: repeat-x;
    background-size: auto 144px;
    background-position: left top;
}

Just note: 100% or repeat.