If you have images, there should be a short descriptive text added in the alt-text box from the image add icon in the Rich Text Editor box.
Responsive Design Options:
You can adjust the size of an image based on percentage to ensure that the image will look its best on screens of different sizes (phone, tablet, laptop).
You can choose the alignment of your image in order to make it appear on one side of the box or another. This can be especially useful when you want the image to appear alongside text rather than under or over it.
It is highly recommended that you use the alignment feature rather than attempt to insert your image into a table in your guide. Images in tables work poorly with responsive design.
You can enter an amount of H Space (horizontal space) to indicate how much space you'd like between the image and other elements that might on either side of it. If you don't want to create horizontal space, simply leave the box blank.
You can enter an amount of V Space (vertical space) to indicate how much space you'd like between the image and other elements that might appear over or under. If you don't want to create vertical space, simply leave the box blank.
You can choose the thickness of a border to go around your image. If you don't want a border, simply leave the box blank.
You can use the link tab in Image Properties to link your image to a URL.
Source: WSU Library LibGuide: best practices