First what you need is to wrap the block in the container. Simply click on icon of block and select Convert it to Container. Next step – add Local class. Now, you can simply add subselectors. So, you need to know the class name of the element that you want to customize or select. Don’t forget to add space in subselector, because this means that the child element of this block will be used. So, if I want to customize all text inputs, I add space + input[type=”text”]. It means that I want to select all text inputs which are children of the current block. More about selectors