Creating equality in height among input file fields and other elements with Bootstrap 5

Utilizing a straightforward template to display a registration form with a file attachment field:

/* facing an issue when adjusting the height for myself */
.mycustom {
  line-height: 2.75;
  z-index: 999;
}
<!-- <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="45272a2a31363137243505706b766b67736b">[email protected]</a> -->
<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c5a7aaaab1b6b1b7a4b585f0ebf6ebf7">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa8TmYrSMTPbXqtCOjhUVuu3U" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="96f4f9f9e2e5e2e4f7e6d6a3b8a5b8a4">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWdNbesaHEPMNYZPhcTNXj1NW7ruV9nMuzyjHA4kcBwQBt2LzszTSamS" crossorigin="anonymous"></script>
    
<!-- code -->
<div class="text-center">
  <div class="container col-xl-10 col-xxl-8 px-4 py-5">
    <main>
      <form class="p-4 p-md-5 border rounded-3 bg-light">
        <div class="form-floating mb-3">
          <input type="email" class="form-control" id="floatingInput" placeholder="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="016f606c64416479606c716d642f626e6c">[email protected]</a>">
          <label for="floatingInput">Email address</label>
        </div>
        <div class="form-floating mb-3">
          <input type="password" class="form-control" id="floatingPassword" placeholder="Password">
          <label for="floatingPassword">Password</label>
        </div>
        <div class="mb-3">
          <input type="file" class="form-control mycustom" id="formFiles" name="files" aria-describedby="inputGroupFileAddon04" aria-label="Upload" required>
        </div>
        <div class="checkbox mb-3">
          <label>
            <input type="checkbox" value="remember-me"> Remember me
          </label>
        </div>            
        <button class="w-100 btn btn-lg btn-primary" type="submit">Sign up</button>
        <hr class="my-4">
        <small class="text-muted">By clicking Sign up, you agree to the terms of use.</small>
      </form>
    </main>
  </div>
</div>

Implemented this CSS snippet to maintain the height consistency in the input file, but interested in a responsive method to specify the height:

.mycustom{
  line-height: 2.75;
  z-index: 999;
}

UPDATE: Seeking to specify the same height for the file input field while ensuring the template remains responsive, not just how to declare a CSS style.

htmlcssbootstrap-5

Answer №1

The Bootstrap framework incorporates precise and robust CSS class references to define styles. For further insight into their effectiveness and comprehension, refer to another question: Why does an attribute selector have higher specificity than a class?.

https://i.sstatic.net/DwTK2.png

The linked answer elucidates three methods to override the original style.

Issue with Equally Strong References

If you aim to override a reference with equal potency, the customary approach involves appending it later in the corresponding file. Nonetheless, in this scenario, two distinct files are involved: the initially loaded bootstrap.min.css and your personal style.css code. As these files are not consolidated, the settings of the initial file can only be superseded by stronger references.

Solution #1 - !important

Usage of this method is discouraged for maintaining code clarity and comprehensibility. Nevertheless, it serves as a quick solution when immediate results are required.

.mycustom {
  line-height: 200px !important; /* here */
}

Solution #2 - 
inline <div style="...">

This approach lacks reusability. Generally, prioritizing reusable CSS classes over inline styles is preferred.

<input
  type="file"
  class="form-control"
  style="line-height: 200px;"
  id="formFiles"
  name="files"
  aria-describedby="inputGroupFileAddon04"
  aria-label="Upload"
  required
>

Solution #3 - Stronger Rule as the Original (Recommended)

Opting to avoid the use of !important and prioritizing reusable CSS classes over inline styles, as advised in most cases, necessitates creating an override that matches the strength of the original formatting.

.form-control.mycustom {
  line-height: 200px !important; /* working - overrides the original */
}

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