Answers for "change background of svg css"

set svg background color css

/* You can use CSS masks, With the 'mask' property, you create a mask that is applied to an element. */
background-color: red;
-webkit-mask-image: url(icon.svg);
mask-image: url(icon.svg);

svg background css

body {
  background-image: url("/assets/background.svg");
}