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ID Selectors

An ID selector matches an HTML element based on the value of its id attribute. ID selectors are declared using the pound (#) symbol. For example, if an element has an id attribute with the value main-content:

<div id="main-content">...</div>

you can target that element with CSS, like this:

#main-content {
  border: 2px dotted tomato;

IDs Sho...