border-bottom: border-width border-style border-color;
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border-bottom-width
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Specifies the width of the bottom border; its default value is "medium", and this falls under the required category.
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border-bottom-style
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Specifies the style of the bottom border. Its default value is "none", and this falls under the required category.
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border-bottom-color
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Specifies the color of the bottom border. Its default value is the color of the text, and this falls under the optional category.
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