how to make multiple borders using box shadow in css

1.many_borders {
2  box-shadow:
3    0 0 0 10px red,
4    0 0 0 15px blue,
5    0 0 0 20px red,
6    0 0 0 25px blue;
7}
8
9/* 
10	Here the fourth parameter is called the spread and it basically means after how many
11	pixels the shadow should start spreading
12*/