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Why did we use <li class="grid-25 tablet-grid-50">. There's no this class name in index.html. ?
Steven Parker227,167 Points
These classes are both defined in css/main.css.
You're right, they aren't used in index.html, which only means they aren't in the document to start with.
<div> element that has the id of photos. Those classes will then be targeted by the CSS rules to give them the desired styling.
Thank you Steven .