Choosing CSS background color
The CSS background-color property lets you change the background color for the selected element:
CSS background color is applied to the padding, but not the margin of the element. It is an animatable property, introduced in CSS1:
.example {
  max-width: 100px;
  height: 100px;
  margin: 10px;
  padding: 10px;
  background-color: #333;
}
CSS background-color property syntax
To apply a CSS background color, you need to follow the syntax example below:
background-color: value;
The default value for this property is transparent. You can change it using the name, RGB or HEX value of the color you choose:
body {
  background-color: rgb(0, 255, 0);
}
p {
  background-color: red;
}
Tip: to get the value for the exact color tone you need, use the Pickeristic color picker.