How Can I Customize the Appearance of Bootstrap\'s File Input Button?

Enhance Bootstrap with a Tailored File Input Button

Despite its popularity, Twitter Bootstrap currently lacks a visually appealing file element upload button. While the button remains a native browser element that seems untouchable by CSS, there are viable solutions to customize its appearance.

Bootstrap 3-5: A Simple HTML Solution

Leveraging HTML alone, you can create a functional file input control resembling a button:

<label class="btn btn-default">
    Browse <input type="file" hidden>
</label>

Modern browsers, including IE9 , readily support this approach. However, for compatibility with older IE versions, consider the following legacy approach.

Legacy Approach for Old IE

To support IE8 and below, employ this HTML/CSS combination:

<span class="btn btn-default btn-file">
    Browse <input type="file">
</span>

.btn-file {
    position: relative;
    overflow: hidden;
}
.btn-file input[type=file] {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    font-size: 100px;
    text-align: right;
    filter: alpha(opacity=0);
    opacity: 0;
    outline: none;
    background: white;
    cursor: inherit;
    display: block;
}

This technique, known as "CSS bloat," compensates for the lack of file input activation upon label clicking in old IE by:

• Spanning the file input across the full width/height of its container
• Concealing the file input element

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