How to create a triangular shape with curved border?

Question

I want to do this shape using CSS not as an image can I but I get the green shape and I can\'t get the all background transparent !

#arrowbox:before {
             


        

Answer 1

my best (for the moment...)

.corn6 {
  border-top: 1px solid darkblue;
  border-bottom: 1px solid darkblue;
  width: 200px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  position: relative;
  margin-left: 30px;
}
.corn6::before,
.corn6::after {
  display: block;
  position: absolute;
  top:0;
  width: 20px;
  height: 20px;
  border-top: 1px solid darkblue;
  border-right: 1px solid darkblue;
  content:'';
}
.corn6::before {
  left: 4px;
  transform: translateX(-50%) rotate(225deg) translateY(-5px) 
} 
.corn6::after {
  right: -4px;
  transform: translateX(50%) rotate(45deg) translateY(5px) 
} 

 text