How Can I Stretch or Scale a CSS Background to Fit Its Container?

Stretching and Scaling CSS Backgrounds

Question: How can you make a CSS background stretch or scale to fit its container?

Answer:

To achieve this, you can leverage the background-size property in CSS3.

#my_container {
    background-size: 100% auto; /* width and height, can be %, px or whatever. */
}

This property is supported by most modern browsers since 2012, enabling you to control both the width and height of your background. By setting the width to 100%, you ensure that the background spans the entire container's width. The auto setting for the height will automatically adjust to maintain the background's aspect ratio.

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