Slide Over
When viewed computers, the text block and the image sit side by side. At the break point, the text block slides over the image with a transparent background.
The image can be situated to the left or right and has responsive width and fixed height. When viewed on mobile phones in portrait mode, the image becomes viewport height and fills the height of the device window.
Item Relative Width
Since the CSS Grid Layout Module is being used, the items can be set to occupy any number of columns.
If both the text block an the image are each set to span one column, they will each occupy 50% of the width.
If the text block is set to occupy 2 columns and the image three columns, the text will occupy 2/5 or 40% and the image 3/5 or 60%.
Image
The image has an alt text attribute for entering keywords for the search engines and should be cropped to the required size before importing into EverWeb.
The actual size will depend on the maximum width of the Slide Over widget, the relative with of the image and the break point at which the image becomes full width. An image width of about 800px should be wide enough for most purposes. The height should be around the same height as the widget's height setting.