According to the American Bar Association's wording on "Best Practices for Ensuring Enforceability" [0]
> There is a check-box that users must click adjacent to an affirmation similar to, “By clicking on the box, you are indicating that you have read and agree to the Terms of Use”;
> The webpage is designed so that if the user does not check the box manifesting assent to the terms, the user cannot proceed in the transaction;
> In addition to a check-box that users must click, the terms of use are available either in a nearby scrolling text box or a nearby hyperlink;
> Any hyperlink of the terms is obvious, e.g., “Terms of Use” is underlined and has decent size lettering and visible coloring (not small lettering and not obfuscatory coloring);
> Any hyperlink of the terms has a central or obvious location on the webpage, e.g., the hyperlink is directly below the “I Agree” button (not relegated to the bottom of the webpage, which would require the user to scroll down to a submerged portion of the webpage);
> Any hyperlink of the terms immediately displays the terms (instead of requiring the user to click on a series of hyperlinks to view the terms);
> The terms of use are evident in every webpage on the website (rather than visible on only one webpage), in addition to requiring users to attest that they have read the terms of use;
> The terms are in readable font (at least 12 point); and
> The agreement contains all requisite elements of an enforceable contract (e.g., consideration, sufficiently definite material terms, etc.).58
[0] https://www.americanbar.org/publications/communications_lawy...