Referring to a snippet from the MUI documentation on custom switches, you have the option to assign the backgroundImage property to an Mui icon by adhering to the prescribed structure:
backgroundImage: `url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="20" width="20" viewBox="0 0 20 20">
<path fill="${encodeURIComponent('#fff',)}"
d="M4.2 2.5l-.7 1.8-1.8.7 1.8.7.7 1.8.6-1.8L6.7 5l-1.9-.7-.6-1.8zm15 8.3a6.7 6.7 0 11-6.6-6.6 5.8 5.8 0 006.6 6.6z"/>
</svg>')`,
The process may seem convoluted due to the requirement for the precise svg path (the 'd' attribute in the aforementioned example). To ascertain the 'd' value for the svg you wish to utilize, you can locate the icon's file within node modules (e.g node_modules > @mui > icons-material > DriveEtaRounded.js):
DriveEtaRound.js:
"use strict";
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _createSvgIcon = _interopRequireDefault(require("./utils/createSvgIcon"));
var _jsxRuntime = require("react/jsx-runtime");
var _default = (0, _createSvgIcon.default)( /*#__PURE__*/(0, _jsxRuntime.jsx)("path", {
//
// ---- d value here \/
//
d: "M18.92 5.01C18.72 4.42 18.16 4 17.5 4h-11c-.66 0-1.21.42-1.42 1.01l-1.97 5.67c-.07.21-.11.43-.11.66v7.16c0 .83.67 1.5 1.5 1.5S6 19.33 6 18.5V18h12v.5c0 .82.67 1.5 1.5 1.5.82 0 1.5-.67 1.5-1.5v-7.16c0-.22-.04-.45-.11-.66l-1.97-5.67zM6.5 15c-.83 0-1.5-.67-1.5-1.5S5.67 12 6.5 12s1.5.67 1.5 1.5S7.33 15 6.5 15zm11 0c-.83 0-1.5-.67-1.5-1.5s.67-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM5 10l1.27-3.82c.14-.4.52-.68.95-.68h9.56c.43 0 .81.28.95.68L19 10H5z"
//
// ---- d value here /\
//
}), 'DriveEtaRounded');
exports.default = _default;
Your final outcome should resemble:
backgroundImage: `url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="20" width="20" viewBox="0 0 20 20">
<path fill="${encodeURIComponent('#fff',)}"
d="M18.92 5.01C18.72 4.42 18.16 4 17.5 4h-11c-.66 0-1.21.42-1.42 1.01l-1.97 5.67c-.07.21-.11.43-.11.66v7.16c0 .83.67 1.5 1.5 1.5S6 19.33 6 18.5V18h12v.5c0 .82.67 1.5 1.5 1.5.82 0 1.5-.67 1.5-1.5v-7.16c0-.22-.04-.45-.11-.66l-1.97-5.67zM6.5 15c-.83 0-1.5-.67-1.5-1.5S5.67 12 6.5 12s1.5.67 1.5 1.5S7.33 15 6.5 15zm11 0c-.83 0-1.5-.67-1.5-1.5s.67-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM5 10l1.27-3.82c.14-.4.52-.68.95-.68h9.56c.43 0 .81.28.95.68L19 10H5z"/>
</svg>')`,
Be cautious to use 'd="... and not d:"...