Applying a margin to a CSS div at the bottom may cause it to not

Question

Applying a margin to a CSS div at the bottom may cause it to not

I'm struggling to achieve the desired outcome with my layout:

https://i.stack.imgur.com/CvLFl.png

I have successfully replicated the image, but only when my div is not floating on the page (without margin applied and without using position: absolute). Otherwise, the green rectangle is not visible.

Here is my HTML structure:

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="body">
        <div class="top">
          Top content
        </div>
        <div class="middle">
          Middle content
        </div>
        <div class="bottom">
            Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

In the .interface CSS, I have the following:

.interface
{
  position: absolute;
  top: 15%;
}

When using this CSS code, the green rectangle remains invisible. If I remove position: absolute (and consequently, stop applying top: 15%), I am able to see the green rectangle.

You can observe the issue in this JSFiddle: https://jsfiddle.net/v9euwdz3/

How can I ensure that the DIV is displayed at a specific level from the top without altering my HTML structure?

css

Answer 1

Answer №1

Here is the desired layout using flex:

.container {
  display: flex;
  flex-direction: column;
  background-color: blue;
  justify-content: space-between;
  height: 100vh;
}

.navbar {
  background-color: white;
  height: 15vh;
}

.header {
  background-color: green;
  height: 60px;
}

.content {
  background-color: yellow;
  flex-grow: 1;
}

.footer {
  background-color: red;
  height: 50px;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="container">
        <div class="navbar">
          SPACE
        </div>
        <div class="header">
          Top content
        </div>
        <div class="content">
          Middle content
        </div>
        <div class="footer">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

You can substitute margin-top: 15%; for a placeholder div if needed

.container {
  display: flex;
  flex-direction: column;
  background-color: blue;
  justify-content: space-between;
  height: 100vh;
}

.header {
  margin-top: 15vh;
  background-color: green;
  height: 60px;
}

.content {
  background-color: yellow;
  flex-grow: 1;
}

.footer {
  background-color: red;
  height: 50px;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="container">
        <div class="header">
          Top content
        </div>
        <div class="content">
          Middle content
        </div>
        <div class="footer">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

(I opted for vh over % to ensure proper display in this code snippet)

Answer 2

Here is the desired layout using flex:

.container {
  display: flex;
  flex-direction: column;
  background-color: blue;
  justify-content: space-between;
  height: 100vh;
}

.navbar {
  background-color: white;
  height: 15vh;
}

.header {
  background-color: green;
  height: 60px;
}

.content {
  background-color: yellow;
  flex-grow: 1;
}

.footer {
  background-color: red;
  height: 50px;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="container">
        <div class="navbar">
          SPACE
        </div>
        <div class="header">
          Top content
        </div>
        <div class="content">
          Middle content
        </div>
        <div class="footer">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

You can substitute margin-top: 15%; for a placeholder div if needed

.container {
  display: flex;
  flex-direction: column;
  background-color: blue;
  justify-content: space-between;
  height: 100vh;
}

.header {
  margin-top: 15vh;
  background-color: green;
  height: 60px;
}

.content {
  background-color: yellow;
  flex-grow: 1;
}

.footer {
  background-color: red;
  height: 50px;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="container">
        <div class="header">
          Top content
        </div>
        <div class="content">
          Middle content
        </div>
        <div class="footer">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

(I opted for vh over % to ensure proper display in this code snippet)

Answer 3

Answer №2

It's common knowledge that an element with a height set to `100%` will take up `100%` of its parent's height. If the parent's height is not explicitly defined, it can lead to errors. You might have encountered this issue when you set the width of `body` to `100%`, which wasn't the correct approach. Instead, setting it to `100vh` would make it fit the screen properly, especially on a computer. Additionally, I noticed some mistakes in your calculations, like subtracting percentages from pixels in `height: calc(100% - 150px)`. These were simple errors that needed correction.

html,
body {
  height: 100vh;
}

.app {
  position: relative;
  height: 100%;
  display: flex;
}

.interface {
  position: absolute;
  height: 100%;
  top: 15%;
}

.view {
  position: fixed;
  height: 100%;
  background-color: #ccc;
  width: 350px;
}

.body {
  position: relative;
  height: 100%;
}

.body .top {
  height: 15%;
  border: 1px solid #000;
}

.body .middle {
  height: 60%;
  border: 1px solid red;
}

.body .bottom {
  height: 20%;
  border: 1px solid green;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="body">
        <div class="top">
          Top content
        </div>
        <div class="middle">
          Middle content
        </div>
        <div class="bottom">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

If you want to view the result correctly in the snippet, make sure to observe it in full page mode. Also, note that when viewing the result through jsfiddle, there may be a scrollbar in the result section that hides part of the `footer`.

Answer 4

It's common knowledge that an element with a height set to `100%` will take up `100%` of its parent's height. If the parent's height is not explicitly defined, it can lead to errors. You might have encountered this issue when you set the width of `body` to `100%`, which wasn't the correct approach. Instead, setting it to `100vh` would make it fit the screen properly, especially on a computer. Additionally, I noticed some mistakes in your calculations, like subtracting percentages from pixels in `height: calc(100% - 150px)`. These were simple errors that needed correction.

html,
body {
  height: 100vh;
}

.app {
  position: relative;
  height: 100%;
  display: flex;
}

.interface {
  position: absolute;
  height: 100%;
  top: 15%;
}

.view {
  position: fixed;
  height: 100%;
  background-color: #ccc;
  width: 350px;
}

.body {
  position: relative;
  height: 100%;
}

.body .top {
  height: 15%;
  border: 1px solid #000;
}

.body .middle {
  height: 60%;
  border: 1px solid red;
}

.body .bottom {
  height: 20%;
  border: 1px solid green;
}

<div class="app">
  <div class="interface">
    <div class="view">
      <div class="body">
        <div class="top">
          Top content
        </div>
        <div class="middle">
          Middle content
        </div>
        <div class="bottom">
          Bottom content
        </div>
      </div>
    </div>
  </div>
</div>

If you want to view the result correctly in the snippet, make sure to observe it in full page mode. Also, note that when viewing the result through jsfiddle, there may be a scrollbar in the result section that hides part of the `footer`.

Applying a margin to a CSS div at the bottom may cause it to not

Answer №1

Answer №2

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