我對Bootstrap移動設計有問題。即使我鍵入col-sm-12，它在移動設計中也不會精確地調整大小。我該如何解決這個問題？我正在使用bootstrap 5.3。

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<div class="container">
  <div class="row">
    <div class="col-md-6 col-sm-12 mx-auto">
      <div class="card mt-5">
        <div class="card-header">
          <div class="card-text">
            <span>Giri?</span>
          </div>
        </div>
        
        <div class="card-body">
          <form method="POST" action="">
            <div class="mb-3">
              <label class="form-label" for="kullaniciAdi">Kullan?c? Ad?:</label>
              <div class="input-group">
                <span class="input-group-text"><i class="fa-solid fa-user"></i></span>
                <input class="form-control" type="text" name="kullaniciAdi" placeholder="Lütfen kullan?c? ad?n?z? giriniz." required>
              </div>
            </div>
            
            <div class="mb-3">
              <label class="form-label" for="sifre">?ifre:</label>
              <div class="input-group">
                <span class="input-group-text"><i class="fa-solid fa-lock"></i></span>
                <input class="form-control" type="password" name="sifre" placeholder="Lütfen ?ifrenizi giriniz." required>
              </div>
            </div>
            
            <button class="btn btn-outline-success" type="submit">Giri? Yap</button>
            <a class="btn btn-outline-primary" role="button" type="button" href="Kayit">Kay?t Ol</a>
          </form>
        </div>
      </div>
    </div>
  </div>
</div>

我懷疑這是因為sm斷點比你的視窗寬度大。嘗試使用col-12，這是默認的(xs)設置。

xs(無):& lt576像素

sm:& gt；= 576像素

MD:& gt；= 768像素

LG:& gt；= 992像素

XL:& gt；= 1200像素

xxl:& gt；= 1400像素