Login to your SharePoint list/library.
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Click Gear icon on top right hand side and click Edit page.
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Click Add a Web Part link.
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Select Content Editor Web part under the category Media and Content. Click Add.
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Click “Click here to add new content”.
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Click Edit Source.
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Add CSS given below and click OK.
<style type='text/css'> Â
    .ms-vh-div[DisplayName='<ColumnName>'] { Â
        width: 250px; Â
    } Â
</style> Â
Click Stop Editing.
Now, we can see the increase in the width.?
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Conclusion
In this article, I explained how to increase the SharePoint list column width, using CSS.