Can I have different colored left and top borders in CSS with straight join?

Question

I would like to have a border that is 4px thick pink on the left and 1px grey elsewhere:

border: 1px solid #E5E5E5;
b         


        

Answer 1

this should work but requires extra markup:

.outer {
    border: 1px solid #E5E5E5;
    border-left: 0;
}

.inner {
    border-left: 4px solid #F24495;
}

and

<div class="outer">
    <div class="inner">
        ...
    </div>
</div>

Answer 2

If you wish to use the :before pseudo selector you need to set some content as well. See for example this jsfiddle with the following sample code:

<div>Container</div>

CSS:

div {
    border: 10px solid black;
    border-left-width: 0;
}
div::before {
    border: 10px solid orange;
    border-right-width: 0;
    content: '';
}

Displays as:

Edit
Hmm, although this should strictly answer the question, while trying to adapt my solution into the question's fiddle I find this doesn't play very well with paddings. Open to suggestions/edits/other answers that can handle that bit :(...

Answer 3

.item::before was the right approach, but it needs a bit of work past a single border-left property. You'll need to make the pseudo element visible (display: block; content: "";), position the pseudo element on the left side of .item, and stretch it to line up with the top and bottom borders properly.

While this can be done manually, I highly recommend using CSS Variables (or variables in your preprocessor) since it makes updating the widths of borders less error-prone and painful.

.item {
  display: inline-block;
  padding: 0.2em 0.3em;
  background: #f8f8f8;
  color: #454545;

  /* Set border widths with variables */
  --top-border-width: 4px;
  --bottom-border-width: var(--top-border-width);
  --left-border-width: 16px;
  --right-border-width: var(--top-border-width);

  /* Set border styles for each side */
  border-top: var(--top-border-width) solid #e4e4e4;
  border-bottom: var(--bottom-border-width) solid #e4e4e4;
  border-right: var(--right-border-width) solid #e4e4e4;

  /* Remove the left border and add blank space where the border should be placed */
  border-left: 0;
  margin-left: var(--left-border-width);

  /* Contain the ::before */
  position: relative;
}

.item::before {
  /* Give the pseudo element substance */
  display: block;
  content: "";

  /* Add a left border with a straight edge */
  border-left: var(--left-border-width) solid #f84995;

  /* Position pseudo element's border where the normal border would have been placed */
  position: absolute;
  top: calc(0px - var(--top-border-width));
  bottom: calc(0px - var(--bottom-border-width));
  left: calc(0px - var(--left-border-width));
}

<h1 class="item">Gen.2</h1>

Answer 4

Background

By default CSS uses miter joints (45° angles) for all borders joints. Hence, to achieve square joints (90° angles) for any border, you can either use (1) inner box-shadow, (2) pseudo-elements or (3) background-image and multiple linear-gradients.

Let's assume you have the following element that you want to style:

<div></div>

Option 1: square joints using box-shadow

div {
  /* downside of using box-shadow, you need to add the   */
  /* inner border size to the padding on top of any      */
  /* additional padding you might want                   */
  padding: 20px;
  /* by changing the order of your box-shadows, you      */
  /* can modify which borders overlap each other         */
  box-shadow:
    /* left "inner border" */
    inset 20px 0 0 0 red,
    /* right "inner border" */
    inset -20px 0 0 0 grey,
    /* top "inner border" */
    inset 0 20px 0 0 grey,
    /* bottom "inner border" */
    inset 0 -20px 0 0 grey;
}

• View on JSFiddle
• Browser support for box-shadow

Option 2: square joints pseudo-elements

div {
  border: 20px solid grey;
}

div::before {
  position: absolute;
  background-color: red;
  content: "";
  width: 20px;
  /* we need to add the height of the top and bottom    */
  /* border to the pseudo-elements' height as the       */
  /* inset border is not included in the height of the  */
  /* div even when "box-sizing: border-box" is set.     */
  height: calc(100% + 20px + 20px);
  top: -20px;
  left: -20px;
}

• View on JSFiddle
• Browser support for pseudo-elements

Option 3: square joints using background-image and multiple linear-gradients

div {
  /* downside of using multiple linear-gradients, you   */
  /* need to add the inner border size to the padding   */
  /* on top of any additional padding you might want    */
  padding: calc(20px + 10px);
  background-image: 
    /* left "inner border" */
    linear-gradient(to right, red 20px, transparent 20px),
    /* right "inner border" */
    linear-gradient(to left, grey 20px, transparent 20px),
    /* top "inner border" */
    linear-gradient(grey 20px, transparent 20px),
    /* bottom "inner border" */
    linear-gradient(to top, grey 20px, transparent 20px);
}

• View on JSFiddle
• Browser support for background-images()
• Browser support for linear-gradient()