Learning a new technology is like putting on new clothes; at some point, we will outgrow those clothes, or they no longer present the appeal that attracted us to them at the time of purchase.
It's at times like this we need to progress onto something more advanced or with additional functionality, otherwise our development will come to a standstill! Thankfully, there are literally dozens of options available online that we can explore—one might be forgiven for thinking that there are too many and where does one start?
A great starting point is a responsive framework such as Bootstrap or Unsemantic; these have been made to improve the usability and help speed up the process of development. These frameworks were introduced with the aim of providing a grid or foundation for rapid prototyping of the various mobile functionalities, layouts which allow the designers and developers to better make use of their development time.
This is just one part of what is available to help you...