Question

I would like to know how to draw a triangle with a transparent background with borders? The examples I had found do not provide borders. Any way to accomplish this?

Answer 1

Demo

 .triangle {
     width: 0;
     height: 0;
     border-left: 50px solid transparent;
     border-right: 50px solid transparent;
     border-bottom: 100px solid red;
     position:relative;
 }
 .triangle:after{
     content:'';
     position:absolute;
     top:5px;
     left:-45px;
     width: 0;
     height: 0;
     border-left: 45px solid transparent;
     border-right: 45px solid transparent;
     border-bottom: 92px solid white;
}