How to make shapes with CSS which have borders?

Tags: html,css,css3

Problem :

I am looking for a way to make various geometric shapes using only HTML/CSS. I found my answer here, however it doesn't allows me to give borders to my shape. For instance I can get an inverted isosceles triangle using

#triangle-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;

It gives me this output:

enter image description here

However, now i can't add borders to the triangle like this:

enter image description here

Is there a way i can achieve what i want? Also, is it possible to give effects to it properly (like shadow effects etc.)

Note: I have a limitation of only being able to use inline CSS

Solution :

Well, It's kind of messy but if the triangle is not dynamic, this should work. The idea is to place another absolutely positioned triangle with appropriate size and borders under the existing one by using :before pseudo element.

Something like this

#triangle-down {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid red;   

    width: 0;
    height: 0;
    border-left: 55px solid transparent;
    border-right: 55px solid transparent;
    border-top: 110px solid blue;

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