CSS BORDER-RIGHT-WIDTH

This property controls the thickness (width) of the right border of an element’s rendering box. Negative values are not allowed.

Example
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.something {
  border-right-width: 10px
}
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<span style="border-right-width: 10px">Some text</span>

Possible Values

inherit: Explicitly sets the value of this property to that of the parent.
thin | medium | thick: Renders a “thin”, “medium” or “thick” border on the right side of the element’s rendering box. The actual thickness of these border values is not specified, but “thin” should have a smaller thickness than “medium”, which should have a smaller thickness than “thick”.
[length]: Sets the width of the border on the right side of the element’s rendering box to an explicit measurement.