Example code is slightly wrong, cannot just copy&paste it to config.
This fixed it for me, when adding middle of other modules configs.
{
module: "MMM-CSSBackgrounds",
position: "fullscreen_below",
config: {
theme: "snowflakes"
/* Choose from: particles, firefly, risingparticles animatedgradient, animatedbgcolor, slidingdiagonal, lavalamp, bokeh, bokehgrey, risingcubes, tritravelers, bubbles, bubblescoloredbg, beer, snowflakes, blobs */
}
},
Example code is slightly wrong, cannot just copy&paste it to config.
This fixed it for me, when adding middle of other modules configs.