How Can I Prevent CSS Hover Borders from Shifting Adjacent Elements?

Adjusting Element Positioning with CSS Hover Borders

Creating hover effects with CSS borders can sometimes cause adjacent elements to shift or "jump"slightly. This issue arises when the border adds extra width to the element, causing a change in positioning relative to other unbordered elements.

Solution: Transparent Borders

To resolve this positioning issue, add a transparent border to the non-hover state of the element. This ensures that all elements have the same width regardless of their hover status, preventing any unexpected shifts.

Example: Vertical Anchor Menu

Consider a vertical menu of anchors within an unordered list. The following CSS snippet demonstrates the issue:

div a:visited, #homeheader a {
    text-decoration: none;
    color: black;
    margin-right: 5px;
}

div a:hover {
    background-color: #D0DDF2;
    border-radius: 5px;
    border: 1px solid #102447;
}

div li {
    padding: 0;
    margin: 0px 10px;
    display: inline;
    font-size: 1em;
}

Hovering over any anchor will cause all anchors to the left to move slightly to the right due to the added border.

To correct this, a transparent border can be added to the non-hover state:

#homeheader a:visited, #homeheader a {
    border: 1px solid transparent;
}

This modification ensures that all anchors have a consistent width, eliminating the "jumpiness" effect and maintaining proper element positioning.

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