Further customisation can be achieved by using the HTML text editor widget. 

There are many uses of this however, one of the example is, this widget allows you to use HTML to hide visibility of the template contents by using 'If else' statements. 

Step 1: Under the 'Template' module, select on your Template. 

Step 2: Click on 'Add Content' button. 

Step 3: Click 'Text' widget >> 'Raw HTML Block'