Many times we want an object in the place of an link or a button and when we click on it, it leave an a border kind of line — an outline. Well, unless you click somewhere on the screen, it won't go away. To remove that, we can use outline property of CSS.
CSS Outline Property
An outline is a line that is drawn around elements, OUTSIDE the borders, to make the element "stand out".
Borders and outlines are very similar. However, outlines differ from borders in the following ways:
1. Outlines never take up space, as they are drawn outside of an element's content.
2. According to the spec, outlines don't have to be rectangular, although they usually are.
CSS has the following outline properties:
1. outline-style
2. outline-color
3. outline-width
4. outline-offset
5. outline
CSS Outline Style
The outline-style property specifies the style of the outline, and can have one of the following values:
1. dotted – Defines a dotted outline
2. dashed – Defines a dashed outline
3. solid – Defines a solid outline
4. double – Defines a double outline
5. groove – Defines a 3D grooved outline
6. ridge – Defines a 3D ridged outline
7. inset – Defines a 3D inset outline
8. outset – Defines a 3D outset outline
9. none – Defines no outline
10. hidden – Defines a hidden outline
✅ So, we can use the outline:none, to remove the outline.
NOTE
For links, we can use border and outline both properties as null to solve the problem.
Credit: MDN Docs
border button html tags images link outline property
