SVG Drop Shadow Filter
All SVG filters are defined by < defs > element. It is used for the definition of the filter which is to be used.
The < filter > element is used to define an SVG filter. The element has a required id attribute that identifies the filter.
The < feOffset > element is used to create drop shadow effects.
Code Explanation of the below code is:-
The id attribute of the < filter > element defines a unique name for the filter
The filter attribute of the < rect > element links the element to the "coding_school" filter