Css - How to keep overflowing content in X direction with overflow-y: auto?

MishaMoroshko
August 21, 2023
209 views
0 votes
2 Answers

::after pseudo element is used to render an arrow:

However, when overflow-y: auto is added to the container, the arrow is cut off:

Overflowing in the X direction should be fine (i.e. the arrow should be visible), but overflowing in the Y direction should result in a scrollbar.

Is it possible to keep both the scrollbar and the arrow?

.flex {
  background-color: #eee;
  width: 100px;
  height: 160px;
  display: flex;
  flex-direction: column;
  border: 2px solid #333;
}

.item {
  background-color: #ccc;
  border-bottom: 1px solid #777;
  padding-left: 4px;
  line-height: 28px;
  position: relative;
}

.item3::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 15px 0 15px 15px;
  border-color: transparent transparent transparent #ccc;
  position: absolute;
  left: 100%;
  top: 0;
}

<div class="flex">
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item item3">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
  <div class="item">Item</div>
</div>

Answers

Not the most elegant solution but I allowed for some more width for the indicator arrow by adding a wrapper with a wider width around the whole thing. The border is added on top with a pseudo element. See this answer for a more complete explanation of the overflow property.

.wrapper {
  width: 115px;
  height: 160px;
  position: relative;
}

.wrapper::before {
  content: "";
  width: 100px;
  height: 100%;
  box-sizing: border-box;
  background-color: #eee;
  position: absolute;
  top: 0;
  left: 0;
}


.wrapper::after {
  content: "";
  width: 100px;
  height: 100%;
  box-sizing: border-box;
  border: 2px solid #333;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

.flex {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}



.item {
  background-color: #ccc;
  border-bottom: 1px solid #777;
  padding-left: 4px;
  line-height: 28px;
  position: relative;
  max-width: calc(100% - 15px);
  box-sizing: border-box;
}

.item3::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 15px 0 15px 15px;
  border-color: transparent transparent transparent #ccc;
  position: absolute;
  left: 100%;
  top: 0;
}

<div class="wrapper">
  <div class="flex">
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item item3">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
  </div>
</div>

I am guessing that you want the scrollbar bar inside the container (as it appears in your image) and want the arrow outside of the container. That’s not possible. However, I have a few ideas that can be considered.

As shown in iicaptain’s answer, the width of items can be calculated to compensate for the arrow so that it doesn’t get clipped.

.item {
  width: calc(100% - 15px);
}

The snippet includes examples of when there is and isn’t overflow, using your given code with structural modifications.

*, *:after {
  box-sizing: border-box;
}

.flex {
  width: 115px;
  height: 160px;
  background-color: #eee;
  border: 2px solid #333;
  overflow-y: auto;
}

.item {
  position: relative;
  width: calc(100% - 15px);
  padding-left: 4px;
  background-color: #ccc;
  border-bottom: 1px solid #777;
  line-height: 28px;
}

.item3::after {
  content: "";
  position: absolute;
  left: 100%;
  width: 0;
  height: 0;
  border: 15px solid transparent;
  border-right-width: 0;
  border-left-color: #ccc;
}


.example {
  display: flex;
  column-gap: 5em;
}

<div class="example">

  <div class="flex">
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item item3">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
  </div>

  <div class="flex">
    <div class="item">Item</div>
    <div class="item">Item</div>
    <div class="item item3">Item</div>
    <div class="item">Item</div>
    <div class="item">Item</div>
  </div>

</div>

I played around with iicaptain’s answer and can suggest modifications.

The .wrapper::before pseudo-element was used just to provide a background color. If the background color is wanted, it can be added to the .wrapper rule and there’s no need for this pseudo-element.

.wrapper {
  background-color: #eee;
}

The .wrapper::after pseudo-element is used to render the border around the container. The width can be declared so that the right-side border is in a preferable position, such as to the left of the arrow.

.wrapper {
  width: 115px;
}

.wrapper::after {
  width: 87px;
}

The snippet shows examples of this with and without overflow, as well as with and without a background color.

*, *:before, *:after {
  box-sizing: border-box;
}

.wrapper {
  position: relative;
  width: 115px;
  background-color: #eee;
}

.wrapper::after {
  content: "";
  position: absolute;
  top: 0;
  width: 87px;
  height: 100%;
  border: 2px solid #333;
  pointer-events: none;
}

.flex {
  height: 160px;
  overflow-y: auto;
}

.item {
  position: relative;
  width: calc(100% - 15px);
  padding-left: 4px;
  background-color: #ccc;
  border-bottom: 1px solid #777;
  line-height: 28px;
}

.item3::after {
  content: "";
  position: absolute;
  left: 100%;
  width: 0;
  height: 0;
  border: 15px solid transparent;
  border-right-width: 0;
  border-left-color: #ccc;
}


.example {
  display: flex;
  margin-bottom: 3em;
  column-gap: 3em;
}

.example:nth-of-type(2) .wrapper {
  background-color: inherit;
}

<div class="example">

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

</div>


<div class="example">

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

</div>

If you want to open a can of accessibility issues and/or have a case where users don’t have to be able to scroll, the width and background-color of the .wrapper::before pseudo-element can be used to hide the scrollbar.

.wrapper::before {
  width: 115px;
  background-color: white;
}

*, *:before, *:after {
  box-sizing: border-box;
}

.wrapper {
  position: relative;
  width: 115px;
}

.wrapper::before {
  content: "";
  position: absolute;
  width: 115px;
  height: 100%;
  background-color: white;
}

.wrapper::after {
  content: "";
  position: absolute;
  top: 0;
  width: 87px;
  height: 100%;
  border: 2px solid #333;
  pointer-events: none;
}

.flex {
  height: 160px;
  overflow-y: auto;
}

.item {
  position: relative;
  width: calc(100% - 15px);
  padding-left: 4px;
  background-color: #ccc;
  border-bottom: 1px solid #777;
  line-height: 28px;
}

.item3::after {
  content: "";
  position: absolute;
  left: 100%;
  width: 0;
  height: 0;
  border: 15px solid transparent;
  border-right-width: 0;
  border-left-color: #ccc;
}


.example {
  display: flex;
  column-gap: 5em;
}

<div class="example">

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

  <div class="wrapper">
    <div class="flex">
      <div class="item">Item</div>
      <div class="item">Item</div>
      <div class="item item3">Item</div>
      <div class="item">Item</div>
      <div class="item">Item</div>
    </div>
  </div>

</div>

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Css – How to keep overflowing content in X direction with overflow-y: auto?

Answers