Format: 

Lastname, Firstname. "Title of Webpage." Title of Website, Publisher, Day Month Year, URL. Accessed Day Month Year.

Examples: 

"Goal 6: Ensure Access to Water and Sanitation for All." Sustainable Development Goals: 17 Goals to Transform Our World, United Nations, un.org/sustainabledevelopment/water-and-sanitation. Accessed 12 Dec. 2017.

In-text: ("Goal")

The Wallace Center, et al. Academic Integrity. Rochester Institute of Technology, 2015, rit.edu/twc/academicintegrity. Accessed 12 Dec. 2017.

In-text: (The Wallace Center et al.)

Notes: 

You should provide an access date at the end of your citation, especially if it is unclear what date the information was produced (MLA 53). Provide the direct URL for the item, but omit the http:// or https:// (MLA 110). If the publisher is already captured by the title of the website, you can omit the publisher (MLA 42). Similarly, if the website author is not an individual, but an organization or agency that is the same as the publisher, you can omit the author (see first example) (MLA 25).

Source:
MLA - p. 28