对于焦点前的输入边框。你可以指定你想要使用的最喜欢的颜色和其他css，如填充等

.input {
    padding: 6px 190px 6px 15px;
    outline: #2a65ea auto 105px ;
}

当我们关注输入时。你可以指定你喜欢的颜色轮廓

.input:focus{
    box-shadow: none;
    border-color: none;
    outline: lightgreen auto 5px ;
}

这将工作100%使用这个:

.form-control, .form-control:focus{
   box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
   border: rgba(255, 255, 255, 0);
}

如果你想完全移除阴影，添加类shadow-none到你的输入元素中。

我降落到这个线程寻找方法禁用辉光完全。许多答案对我来说太复杂了。为了简单的解决方案，我只需要一行CSS如下。

input, textarea, button {outline: none; }

如果你想让Chrome显示平台默认的“黄色”轮廓，这里有一些改变。

textarea:focus, input[type="text"]:focus, input[type="password"]:focus, input[type="datetime"]:focus, input[type="datetime-local"]:focus, input[type="date"]:focus, input[type="month"]:focus, input[type="time"]:focus, input[type="week"]:focus, input[type="number"]:focus, input[type="email"]:focus, input[type="url"]:focus, input[type="search"]:focus, input[type="tel"]:focus, input[type="color"]:focus, .uneditable-    input:focus {
    border-color: none;
    box-shadow: none;
    -webkit-box-shadow: none;
    outline: -webkit-focus-ring-color auto 5px;
}

你可以这样修改.form-control:focus颜色而不改变引导样式:

快速修复

.form-control:focus {
        border-color: #28a745;
        box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
    } 

完整的解释

Find the bootstrapCDN version that you are using. E.g. for me right now is 4.3.1: https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.css Search for the class you want to modify. E.g. .form-control:focus and copy the parameters that you want to modify into your css. In this case is border-color and box-shadow. Choose a color for the border-color. In this case I choose to pick up the same green the bootstrap uses for their .btn-success class, by searching for that particular class in the bootstrap.css page mentioned in the step 1. Convert the color you have picked to RGB and add that to the box-shadow parameter without altering the fourth RGBA parameter (0.25) that bootstrap has for transparency.