Check out example codes for "birthday wishes using html code". It will help you in understanding the concepts better.

Code Example 1

Here are some of the best cards that i found : 
1. https://codepen.io/noobplus/pen/MWYGzeY
2. https://codepen.io/CriticalMammal/pen/RPdOep
3. https://codepen.io/HIC/pen/ymJPPz

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