When working with responsive media queries, which property is used to specify the screen size at which specific styles should be applied?

When working with responsive media queries in CSS, the property used to specify the screen size at which specific styles should be applied is the "max-width" or "min-width" property.

Here's a step-by-step explanation:

1. First, you define a media query using the @media rule in your CSS. This rule is used to apply different styles for different media types/devices.

2. Inside the @media rule, you can include a media type and, if needed, one or more expressions that check for certain conditions of a particular media feature.

3. The "max-width" and "min-width" properties are commonly used media features in responsive design. They set the maximum and minimum width of the viewport, respectively, at which the styles inside the media query will be applied.

4. For example, if you want to apply certain styles when the viewport is 600px or less, you would write:

@media screen and (max-width: 600px) {
  /* styles go here */
}

In this case, the "max-width" property is used to specify that the styles inside this media query should be applied when the screen size is 600px or less.