我找不到减少输入窗口宽度的方法。我没有看到或找到任何控制输入窗口宽度的代码。下面的代码取自Bootstrap v5 文档，来自表单元素。
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous" />
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
<form>
<div class="input-group mb-3">
<span class="input-group-text">@</span>
<input type="email" id="email" class="form-control" placeholder="Your email" aria-label="Email" aria-describedby="basic-addon1" />
<button type="submit" class="btn btn-primary btn-md">Sign up</button>
</div>
</form>