What are some strategies to prevent a fixed sidebar from obscuring content while zooming in?

Question

What are some strategies to prevent a fixed sidebar from obscuring content while zooming in?

I've been working on adding a fixed sidebar for a table of contents (TOC) to a website, where the sidebar stays in place as the user scrolls up and down.

My implementation includes the following HTML code:

https://i.sstatic.net/jAY8l.png

and CSS code:

https://i.sstatic.net/Z0LZl.png

I took inspiration from a tutorial I found here: https://www.w3schools.com/howto/howto_js_dropdown_sidenav.asp

Although everything appears fine when viewed at 100% zoom in Chrome, I'm facing issues when zooming in further. The sidebar starts to overlap with some of the adjacent content, causing it to hide behind the sidebar. You can see an example of this problem below: https://i.sstatic.net/Q8cwj.png

If anyone has any suggestions on how to correct this issue and ensure that the table of contents functions properly even when zoomed in, your help would be greatly appreciated!

html css

Answer 1

Answer №1

Managing the Width with CSS

To control the width of your sidebar, consider setting a maximum width using viewport width units (vw).

Unlike other units like %, vh, vmin, and vmax, vw is not affected by zoom variations.

This technique allows you to maintain your sidebar width in pixels or any CSS unit while limiting its maximum size based on the absolute screen width.

Here's an example:

width: 100px;        // Default width
max-width: 25vw;     // Maximum absolute width (not impacted by zoom)

You can also set different max-width values for various screen sizes using media queries. If you prefer your sidebar to always be a certain percentage of the screen width, you can use vw directly in the width property without defining a max-width.

Considerations:

When choosing a CSS unit for width, remember to take into account how they are affected by zoom levels.

Answer 2

Managing the Width with CSS

To control the width of your sidebar, consider setting a maximum width using viewport width units (vw).

Unlike other units like %, vh, vmin, and vmax, vw is not affected by zoom variations.

This technique allows you to maintain your sidebar width in pixels or any CSS unit while limiting its maximum size based on the absolute screen width.

Here's an example:

width: 100px;        // Default width
max-width: 25vw;     // Maximum absolute width (not impacted by zoom)

You can also set different max-width values for various screen sizes using media queries. If you prefer your sidebar to always be a certain percentage of the screen width, you can use vw directly in the width property without defining a max-width.

Considerations:

When choosing a CSS unit for width, remember to take into account how they are affected by zoom levels.

Answer 3

Answer №2

When a position is fixed, it does not impact the placement of other elements:

This element is taken out of the regular document flow, creating no space for it in the overall page layout.

-- https://developer.mozilla.org/en-US/docs/Web/CSS/position#fixed

To work around this behavior, you can align the div.contents's padding-left to match the value set for the width of div.toc. If you're comfortable with CSS variables, utilizing one here would be recommended.

body {
  --toc-width: 30vw;
  --toc-background: red;
}

div.contents {
  /* adjust contents based on toc width */
  padding-left: var(--toc-width);
}

div.toc {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--toc-width);
  background-color: var(--toc-background);
}

<div class="contents">
  <div class="toc"></div>
  <h1>not toc</h1>
</div>

Answer 4

When a position is fixed, it does not impact the placement of other elements:

This element is taken out of the regular document flow, creating no space for it in the overall page layout.

-- https://developer.mozilla.org/en-US/docs/Web/CSS/position#fixed

To work around this behavior, you can align the div.contents's padding-left to match the value set for the width of div.toc. If you're comfortable with CSS variables, utilizing one here would be recommended.

body {
  --toc-width: 30vw;
  --toc-background: red;
}

div.contents {
  /* adjust contents based on toc width */
  padding-left: var(--toc-width);
}

div.toc {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--toc-width);
  background-color: var(--toc-background);
}

<div class="contents">
  <div class="toc"></div>
  <h1>not toc</h1>
</div>

Answer 5

Answer №3

If you're looking to ensure consistent width, consider using percentage values. For instance:

div.toc {
  position: fixed;
  height: 100%;
  width: 15%;
  ...
}

When zooming in, px, em, and rem values may change, but percentages remain constant.

Answer 6

If you're looking to ensure consistent width, consider using percentage values. For instance:

div.toc {
  position: fixed;
  height: 100%;
  width: 15%;
  ...
}

When zooming in, px, em, and rem values may change, but percentages remain constant.

What are some strategies to prevent a fixed sidebar from obscuring content while zooming in?

Answer №1

Managing the Width with CSS

Answer №2

Answer №3

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