The background-color
property defines the background color of an element.
background-color: color | transparent;
.mydiv{
background-color: red;
}
.div2{
background-color: #aaa;
}
.div3{
background-color: rgb(3, 189, 44);}
color: sets the background color to specified value/color.
transparent: sets the background color to transparent. This is the default value.