How to add a box shadow to a css generated arrow?

Question

I'm having difficulty adding a box shadow around the outline of the arrow that was generated using border properties. Is there a way to make the box shadow in the shape the same as the arrow instead of a square box?

Here's a jsfiddle.

HTML:

<a class="bx-prev"></a>
<a class="bx-next"></a>

CSS:

.bx-prev, .bx-next {
  border-right: 15px solid green;
  border-bottom: 15px solid green;
  width: 35px;
  height: 35px;
  top: 200px;
  box-shadow: 0 0 10px 0 rgba(0,0,0,0.5);
}
.bx-prev {
  transform: rotate(135deg);
  position: absolute;
  left: 220px;
}
.bx-next {
  transform: rotate(-45deg);
  position: absolute;
  left: 320px;
}

Answer 1

You can try the blur filter by creating the same arrow with a pseudo element:

.bx-prev,
.bx-next {
  top: 200px;
  position:relative;
}

.bx-prev {
  transform: rotate(135deg);
  position: absolute;
  left: 220px;
}

.bx-next {
  transform: rotate(-45deg);
  position: absolute;
  left: 320px;
}
/*the arrow*/
.bx-prev:before,
.bx-next:before,
.bx-prev:after,
.bx-next:after{
  content:"";
  position:absolute;
  border-right: 15px solid green;
  border-bottom: 15px solid green;
  width: 35px;
  height: 35px;
}
/*the shadow*/
.bx-prev:after,
.bx-next:after{
  border-color: red;
  z-index:-1;
  filter:blur(5px);
}

<a class="bx-prev"></a>
<a class="bx-next"></a>