What many people don’t know is that when you are drawing borders in CSS you are actually drawing triangles. Four triangles each represent one border of a box. With coloring one border and setting the others to transparent, you can create a singular triangle. read more about creating triangles with css

Creating fancy buttons just got more easy with CSS3. You can apply gradients, shadows and corners to elements without using images. Using CSS3 for your buttons make it easy to apply changes like font-size or padding. The techniques used here can be applied to any element such as button, input, a, span, div and so on. read more about css3 button tutorial