Adjusting Bootstrap buttons to have a margin-left of -1px when clicked outside the designated area

I utilized Bootstrap in my project, implementing the following code:

<div class="input-group">
  <input type="text" class="form-control input-lg" autofocus>
  <span class="input-group-btn">
    <button class="btn btn-primary btn-lg" type="button">search</button>
  </span>
</div>

While working with Bootstrap, I came across this snippet of code:

.input-group-btn:last-child > .btn {
    margin-left: -1px;
}

Attempting to avoid the unnecessary margin-left:-1px;, I wrote some CSS but encountered another issue:

Even when clicking outside the

<div class="input-group search-bar">
, the button still seems affected by margin-left:-1px;

This has left me puzzled – should I resort to writing JavaScript to resolve this problem?

Answer №1

According to information found in the Bootstrap source code repository on Github, the use of -1px styles is necessary for button groups where buttons are aligned next to each other to prevent the border from doubling up. When two buttons with a 1px border are placed side by side, it visually creates a 2px border. By shifting the button over by -1px, this issue is resolved and prevents the border from being doubled.

A comment in the actual Github source explains:

// Prevent double borders when buttons are next to each other

Answer №2

The margin of -1px is intentionally included to avoid overlapping borders when buttons are positioned adjacent to each other. This design element serves a specific purpose.

If it's absolutely necessary to remove this margin, it may also be required to modify certain negative margins and z-index values for elements such as .input-group-btn > .btn:hover, :focus, :active, :first-child, and :last-child.

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