What is the best way to prevent centered elements from overflowing the screen using only CSS?

I have noticed that in my code, when I add a lot of elements, some of the content overflows off the screen. It's acceptable if the content goes off the bottom of the screen as it is still accessible. However, I want to prevent it from going off the top of the screen to ensure all elements can be accessed.

Is there a way to achieve this using only CSS and without relying on JavaScript?

Before:

https://i.sstatic.net/Aymix.png

After:

https://i.sstatic.net/u744k.png

function add() {
  items = document.getElementById("items");
  input = document.getElementById("input").value;
  x = document.createElement("p");
  x.innerHTML = input;
  items.appendChild(x);
}
html,
body {
  margin: 0;
  height: 100%;
}

.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}
<body class="centered" id="items">
  <h1>TODO:</h1>
  <input type="text" placeholder="Enter Items Here" id="input" />
  <input type="button" onclick="add();" value="add" />
  
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
  <p>Paragraph.</p>
</body>

Answer №1

My usual approach involves creating containers and applying overflow settings on them as well as on the body when necessary.

Here are some other useful tips:

  • Always use let or const to declare variables in order to maintain appropriate scope.
  • Assign semantic names to your variables instead of using generic labels like x, which may be unclear to yourself or other developers later on.

function add() {
  const itemsContainer = document.getElementById("items");
  const inputText = document.getElementById("itemInput").value;

  const paragraphElement = document.createElement("p");
  paragraphElement.innerHTML = inputText;

  itemsContainer.appendChild(paragraphElement);
}
html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
}

.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.item-wrapper {
  width: 100%;
  text-align: center;
  overflow: auto;
}
<body class="centered">
  <div class="form">
    <h1>TODO:</h1>
    <input type="text" placeholder="Enter Items Here" id="itemInput" />
    <input type="button" onclick="add();" value="add" />
  </div>

  <div id="items" class="item-wrapper"></div>
</body>

Answer №2

To adjust the height of your body using CSS, consider changing it to max-height instead. Here's an example:

html, body {
  /* ... */
  max-height: 100%;
}

By setting the body's height to 100% of the viewport, you can ensure that overflowing elements are accessible through scrolling.

This approach will also position your input form at the top of the screen, as I haven't found a way to do this without placing it there.

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