How to Create a 100% Width Expandable Div with Margins Without Overflow?

How to Display an Expandable Div (100% Width) with Margins

In this scenario, you have a div element with a width of 100% that needs to be expandable while maintaining its margins. The straightforward approach using margin seems to cause some overflow issues. How can you rectify this?

The solution lies in utilizing the calc() CSS function. By subtracting the desired margin value from 100%, you can dynamically adjust the width of the div based on the screen size. This ensures that the entire width of the parent container is utilized without any overlapping or overflow issues.

Here's an updated CSS code snippet that incorporates the calc() function:

#page {
  background: red;
  float: left;
  width: 100%;
  height: 300px;
}

#margin {
  background: green;
  float: left;
  width: calc(100% - 10px);
  height: 300px;
  margin: 10px;
}

Alternatively, you can also consider using padding instead of margin and applying the box-sizing: border-box property. This approach provides similar functionality and is supported by major browsers:

#page {
  background: red;
  width: 100%;
  height: 300px;
  padding: 10px;
}

#margin {
  box-sizing: border-box;
  background: green;
  width: 100%;
  height: 300px;
}

By implementing these techniques, you can effectively display an expandable div with 100% width while maintaining consistent margins across different screen resolutions.

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