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primeiro converter svg para base64:
http://b64.io
usar dessa forma:
background-image: url(data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz48c3ZnIHZlcnNpb249IjEuMSIgaWQ9IkNhbWFkYV8xIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB4PSIwcHgiIHk9IjBweCIgdmlld0JveD0iMCAwIDI0IDI0IiBzdHlsZT0iZW5hYmxlLWJhY2tncm91bmQ6bmV3IDAgMCAyNCAyNDsiIHhtbDpzcGFjZT0icHJlc2VydmUiPjxzdHlsZSB0eXBlPSJ0ZXh0L2NzcyI+LnN0MHtmaWxsOiM5MDI3QjA7fTwvc3R5bGU+PHBhdGggY2xhc3M9InN0MCIgZD0iTTIwLjgsMjF2LTJjMC0yLjYtMi4xLTQuOC00LjgtNC44SDhjLTIuNiwwLTQuOCwyLjEtNC44LDQuOHYyYzAsMC40LDAuMywwLjgsMC44LDAuOHMwLjgtMC4zLDAuOC0wLjh2LTJjMC0xLjgsMS41LTMuMywzLjMtMy4zaDhjMS44LDAsMy4zLDEuNSwzLjMsMy4zdjJjMCwwLjQsMC4zLDAuOCwwLjgsMC44UzIwLjgsMjEuNCwyMC44LDIxeiBNMTIsMTEuOGMtMi42LDAtNC44LTIuMS00LjgtNC44UzkuNCwyLjMsMTIsMi4zczQuOCwyLjEsNC44LDQuOFMxNC42LDExLjgsMTIsMTEuOHogTTEyLDEwLjNjMS44LDAsMy4zLTEuNSwzLjMtMy4zUzEzLjgsMy44LDEyLDMuOFM4LjgsNS4yLDguOCw3UzEwLjIsMTAuMywxMiwxMC4zeiIvPjwvc3ZnPg==);
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