输入字段大小不会变大

Question

我正在使用bootstrap的例子为我的登录页面。它被称为浮动标签.我遇到的唯一的问题是. 输入栏不能得到尽可能大的大小，它应该是在例子中。我是网络编程的新手，任何帮助、技巧和建议都会非常感激。对不起，这可能是一个愚蠢的问题。谢谢你的帮助。

这是我的观点。

<html>
<head>
    <title>Floating labels example · Bootstrap</title>

    <style>
        .bd-placeholder-img {
            font-size: 1.125rem;
            text-anchor: middle;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
    </style>
    <!-- Custom styles for this template -->
    <link href="~/Content/floating-labels.css" rel="stylesheet">
</head>
<body>
    <form class="form-signin">
        <div class="text-center mb-4">
            <img class="mb-3" src="~/Images/Logo.png" alt="" width="100" height="72">
            <p>
                “The kitchen is a place of adventure and entirely fun, not drudgery. I can’t think of anything better to do with family and friends than to be together to create something.” – Ted Allen
            </p>
        </div>

        <div class="form-label-group">
            <input type="text" id="inputUsername" class="form-control" placeholder="Username" autocomplete="off" required autofocus>
            <label for="inputUsername">Username</label>
        </div>

        <div class="form-label-group">
            <input type="password" id="inputPassword" class="form-control" placeholder="Password" required>
            <label for="inputPassword">Password</label>
        </div>

        <div class="checkbox mb-3">
            <label>
                <input type="checkbox" value="remember-me"> Remember me
            </label>
        </div>
        <button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button>
        <p class="mt-5 mb-3 text-muted text-center">&copy; 2017-2020</p>
    </form>
</body>
</html>

这是我的CSS。

html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
}

.form-signin {
    width: 100%;
    max-width: 420px;
    padding: 15px;
    margin: auto;
    align-self: center;
}

.form-label-group {
    position: relative;
    margin-bottom: 1rem;
}

    .form-label-group > input,
    .form-label-group > label {
        height: 3.125rem;
        padding: .75rem;
    }

    .form-label-group > label {
        position: absolute;
        top: 0;
        left: 0;
        display: block;
        width: 100%;
        margin-bottom: 0; /* Override default `<label>` margin */
        line-height: 1.5;
        color: #495057;
        pointer-events: none;
        cursor: text; /* Match the input under the label */
        border: 1px solid transparent;
        border-radius: .25rem;
        transition: all .1s ease-in-out;
    }

    .form-label-group input::-webkit-input-placeholder {
        color: transparent;
    }

    .form-label-group input:-ms-input-placeholder {
        color: transparent;
    }

    .form-label-group input::-ms-input-placeholder {
        color: transparent;
    }

    .form-label-group input::-moz-placeholder {
        color: red;
    }

    .form-label-group input::placeholder {
        color: transparent;
    }

    .form-label-group input:not(:placeholder-shown) {
        padding-top: 1.25rem;
        padding-bottom: .25rem;
    }

        .form-label-group input:not(:placeholder-shown) ~ label {
            padding-top: .25rem;
            padding-bottom: .25rem;
            font-size: 12px;
            color: #777;
        }

/* Fallback for Edge
-------------------------------------------------- */
@supports (-ms-ime-align: auto) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input::-ms-input-placeholder {
        color: #777;
    }
}

/* Fallback for IE
-------------------------------------------------- */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input:-ms-input-placeholder {
        color: #777;
    }
}

/* From Index(floating-labels)
-------------------------------------------------- */
@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem;
    }
}

Answer 1

我确实审查了你的代码，只是检查你的自定义CSS是否正确链接.并检查你的CDN或本地bootstrap文件是否链接！如果你会正确链接，你会得到你正在寻找的东西!

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