So let's start :-
Using text-shadow you can give shadow to your text. Most of the properties of text-shadow are similar to that of box-shadow except spread-radius, yes there is no spread-radius in text-shadow.
text-shadow: X-offset Y-offset blur-radius color;
Remember :- In text-shadow we use smaller value of blur-radius as compared to box-shadow to make shadow look settle.
text-shadow: 5px 5px 2px rgba(0,0,0,1);
Yes we can apply box-shadow on text also. On applying box-shadow to text the shadow which which will be generated will be actually in the box-shape, it will form a box around and then shadow of that box will be generated.
So it is suggested to use text shadow instead.
box-shadow: 5px 5px 2px rgba(0,0,0,.5);
We can also apply drop-shadow on text. Applying drop-shadow and text-shadow will give you a more similar and settle shadow.
filter: drop-shadow(X-offset Y-offset blur-radius color);
filter: drop-shadow(5px 5px 2px rgba(0,0,0,1));
Drop-shadow is used most when we want to add shadow to a .png image we can also apply it to other image formats too but its effect can be understood more clearly by using it on a png file. When we apply drop-shadow to a png image whose background is transparent then the shadow will be formed only around the parts of image where there is content.
filter: drop-shadow(0px 0px 5px rgba(0,0,0,1));
When you apply box-shadow to an image then the shadow formed will be shadow of box-shape, that is you can't see detailing in this shadow.
box-shadow: 0px 0px 25px rgba(0,0,0,.5);
Note :- drop-shadow uses properties as text-shadow use. You can replace text-shadow with drop-shadow but on replacing drop-shadow with text-shadow it won't work as drop-shadow.
You can create a border or multiple borders using box-shadow. To do so you have to use spread-radius. While giving it spread-radius keep in mind that when you are creating a single border then you have to give spread-radius the value of which size of border you want. And if you are creating multiple borders then the spread-radius of next shadow must be give value greater then that of previous.
For single border :-
box-shadow: 0px 0px 20px #fca311;
For multiple borders :-
box-shadow: 0px 0px 15px #fcbf49, 0px 0px 30px #f77f00, 0px 0px 45px #d62828;
Note :- To keep width of borders to be equal you have to increase the spread-radius in its multiples.
Okay hold, there is no rocket science in it, if the spread-radius for first border is 10px then for the second border multiply spread-radius of first border by 2 and similarly for third border multiply spread-radius of first by 3 and so on.
Yes you can add border-radius to the borders you created using box-shadow. To do so you have to add border-radius normally as you always add.
border-radius: 5%; box-shadow: 0px 0px 15px #fcbf49, 0px 0px 30px #f77f00, 0px 0px 45px #d62828;
You can make this whole element look hovering over the background, you just need to add one more shadow along with those three we added previously. In the new shadow we will increase the value of blur-radius to make it look hovering. But remember you have to keep its spread-radius at least equal to that of the previous one.
box-shadow: 0px 0px 15px #fcbf49, 0px 0px 30px #f77f00, 0px 0px 45px #d62828, 0px 0px 50px 45px rgba(0,0,0,.5);
You can create a steps effect using box-shadow, all you have to do is, as you know spread-radius supports negative value, so give negative value to the spread-radius of all shadows and add horizontal offset to it. Remember while adding horizontal offset at least give it positive value higher than the spread-radius if you want steps below the element or give it negative higher value than spread-radius if you want steps above the element.
box-shadow: 0px 30px 0px -15px #fcbf49, 0px 60px 0px -30px #f77f00, 0px 90px 0px -45px #d62828;