Answers for "background color none"

background color none

element {
	background-color: transparent;	
}

css transparent background color

div {
 opacity:25% ; 
}

background color using css

/* To apply color to background you have to use 'background-color' property and value of property is color name. */
html,body {
  background-color: blue;
}

background color

//javascript type css:
document.body.style.backgroundColor = "blue";
// or inline css:
<div style="background-color: blue;"></div>