Bootstrap 透明下拉

Question

我想在我的表单中添加一个透明的 bootstrap 下拉菜单。它是我想要透明的实际按钮，而不是单击按钮时下拉的列表。

这是我的例子：

所以说的没错，就是透明的。但偶尔当我将鼠标悬停在它上面然后悬停远离它时，它会变成蓝色，如下所示：

这是我的 css:

.input-control {
    height: 5rem;
    width: 49%;
    display: inline-flex;
    background-color: transparent;
    border-top-style: none;
    border-right-style: none;
    border-bottom: 1px solid dimgray;
    border-left-style: none;
    -moz-box-shadow:    none;
    -webkit-box-shadow: none;
    box-shadow:         none;
    border-radius: 0;

}

button.input-control:hover {
    background-color: none;
    background: none;
}

.btn-primary.active, .btn-primary:active, .open>.dropdown-toggle.btn-primary {
    /* color: #fff; */
    background-color: transparent;
    border-color: transparent;
}

.btn-primary.active.focus, .btn-primary.active:focus, .btn-primary.active:hover, .btn-primary:active.focus, .btn-primary:active:focus, .btn-primary:active:hover, .open>.dropdown-toggle.btn-primary.focus, .open>.dropdown-toggle.btn-primary:focus, .open>.dropdown-toggle.btn-primary:hover {
    color: #fff;
    background-color: transparent;
    border-color: dimgray;
}

.btn-primary:hover {
    color: #fff;
    background-color: transparent;
    border-color: dimgray;
}

dropdown > button {
    background:none;
    border:none;
    box-shadow:none;
}

HTML:

<div id="find-vegan-products-page" style="height:900px;">
        <div class="form-background">



            <form role="form" style="padding: 40px;">
                <div class="form-group">
                    <div class="dropdown">
                        <button class="btn btn-primary dropdown-toggle input-control no-box-shadow" type="button" data-toggle="dropdown">Dropdown Example
                        <span class="caret"></span></button>
                        <ul class="dropdown-menu">
                            <li><a href="#">HTML</a></li>
                            <li><a href="#">CSS</a></li>
                            <li><a href="#">JavaScript</a></li>
                        </ul>
                      </div>

                </div>
                <div class="form-group">
                    <input type="text" class="form-control input-control no-box-shadow" placeholder="City">
                </div>
                <button type="submit" class="btn btn-default">Submit</button>
            </form>
        </div>
    </div>

如何阻止它变蓝？

Answer 1

尝试使用：

.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    color: #fff;
    background-color: transparent;
    border-color: dimgray;
 }

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