Fixed position of the rotated button placed at a 90-degree angle on the right side of the screen

Recently, I had a project where I had to include a div that was rotated 90 degrees and fixed to the right side of the screen. The challenge was making sure that as you scrolled down, the button moved along with the screen while maintaining responsiveness.

The issue arose when trying to rotate the div using either bootstrap or CSS - the fixed position wouldn't adjust accordingly, leaving some white space to the right of the div. This resulted in a less than ideal layout.

.popup-btn{
  position: fixed;
  width: 100px;
  height; 100px;
  right: 0;
  top: 50%;
  background-color: green;
  padding: 1%;
  -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    transform: rotate(90deg);
}
<div class="popup-btn">
    <a href="#">Example div</a>
</div>

I attempted to use media queries and adjust the positioning with values like right: -5.5%, but it wasn't an elegant solution. Are there any suggestions on properly fixing a div to the right side of the screen?

Here's an example of how the button should stick to the side:

https://i.sstatic.net/3uUVX.png

htmlcssbootstrap-4responsive-design

Answer №1

To achieve this effect, you need to utilize the transform origin property. Adjust the CSS from using right: 0 to left: 100%, and incorporate translateX(-50%) to keep the element centered on the screen.

There appears to be an error in your styling where you are using a semicolon (;) instead of a colon (:) in defining the height property. I am uncertain if this is intentional or not.

Here's the breakdown of the steps:

  • Initially position the button outside the viewport so that its top-left corner extends beyond the screen boundaries.
  • Set the center of rotation as the top-left corner with transform-origin: 0% 0%;.
  • Rotate the element by 90 degrees, ensuring the top-left corner remains the pivot point.
  • Place the button at the vertical center of the screen using top: 50%.
  • Adjust the button horizontally by 50% of its width while considering the 90-degree rotation; use translateX for this translation.

.popup-btn{
  position: fixed;
  width: 100px;
  height: 100px;
  left: 100%;
  top: 50%;
  background-color: green;
  padding: 1%;
  transform-origin: 0% 0%;
  -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    transform: rotate(90deg) translateX(-50%);
}
<div class="popup-btn">
    <a href="#">Example div</a>
</div>

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