How to apply box-shadow on all four sides?

Question

I\'m trying to apply a box-shadow on all four sides. I could only get it on 2 sides:

Answer 1

CSS3 box-shadow: 4 sides symmetry

1. each side with the same color

:root{
  --color: #f0f;
}

div {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  margin: 50px auto;
  width: 200px;
  height: 100px;
  background: #ccc;
}

.four-sides-with-same-color {
  box-shadow: 0px 0px 10px 5px var(--color);
}

2. each side with a different color

:root{
  --color1: #00ff4e;
  --color2: #ff004e;
  --color3: #b716e6;
  --color4: #FF5722;
}

div {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  margin: 50px auto;
  width: 200px;
  height: 100px;
  background-color: rgba(255,255,0,0.7);
}

.four-sides-with-different-color {
  box-shadow: 
    10px 0px 5px 0px var(--color1),
    0px 10px 5px 0px var(--color2),
    -10px 0px 5px 0px var(--color3),
    0px -10px 5px 0px var(--color4);
}

screenshots

refs

https://css-tricks.com/almanac/properties/b/box-shadow/

https://www.cnblogs.com/xgqfrms/p/13264347.html