outline on only one border

Question

How to apply an inset border into an HTML element, but just only on one side of it. Until now, I\'ve been using an image to do that (GIF/PNG) that I would

Answer 1

I like to give my input field a border, remove the outline on focus, and "outline" the border instead:

input {
  border: 1px solid grey;

  &:focus {
    outline: none;
    border-left: 1px solid violet;
  }
 }

You can also do it with a transparent border:

input {
  border: 1px solid transparent;

  &:focus {
    outline: none;
    border-left: 1px solid violet;
  }
 }

Answer 2

You can use box-shadow to create an outline on one side. Like outline, box-shadow does not change the size of the box model.

This puts a line on top:

box-shadow: 0 -1px 0 #000;

I made a jsFiddle where you can check it out in action.

---

INSET

For an inset border, use the inset keyword. This puts an inset line on top:

box-shadow: 0 1px 0 #000 inset;

Multiple lines can be added using comma-separated statements. This puts an inset line on the top and the left:

box-shadow: 0 1px 0 #000 inset,
            1px 0 0 #000 inset;

For more details on how box-shadow works, check out the MDN page.

Answer 3

Try with Shadow( Like border ) + Border

border-bottom: 5px solid #fff;
box-shadow: 0 5px 0 #ffbf0e;

Answer 4

I know this is old. But yeah. I prefer much shorter solution, than Giona answer

[contenteditable] {
    border-bottom: 1px solid transparent;
    &:focus {outline: none; border-bottom: 1px dashed #000;}
}

Answer 5

only one side outline wont work you can use the border-left/right/top/bottom

if i an getting properly your comment

Answer 6

Outline indeed does apply to the whole element.

Now that I see your image, here's how to achieve it.

.element {
  padding: 5px 0;
  background: #CCC;
}
.element:before {
  content: "\a0";
  display: block;
  padding: 2px 0;
  line-height: 1px;
  border-top: 1px dashed #000; 
}
.element p {
  padding: 0 10px;
}

<div class="element">
  <p>Some content comes here...</p>
</div>

(Or see external demo.)

All sizes and colors are just placeholders, you can change it to match the exact desired result.

Important note: .element must have display:block; (default for a div) for this to work. If it's not the case, please provide your full code, so that i can elaborate a specific answer.