How to remove blue outline of select option in Twitter Bootstrap - css

Question

I am working on this example and am seeking how to get rid of that blue outline for drop-down select button and the Search inbox inside the drop down menu. See this image:
I already tried:
.btn-default {
outline: none !important;
box-shadow: none !important;
background-color: transparent !important;
background-image: none !important;
}
input, textarea, select, a { outline: none !important; }
input:focus, textarea:focus, select:focus{ outline: none; }
but they are not doing the trick.

Answer 1

Bootstrap form input elements do not use the outline property, but rather recreate it using box-shadow. You were on the right track with what you were doing, but the style that causes this is the following:
.form-control:focus {
border-color: #66afe9;
outline: 0;
-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075),0 0 8px rgba(102,175,233,.6);
box-shadow: inset 0 1px 1px rgba(0,0,0,.075),0 0 8px rgba(102,175,233,.6);
}
You will want to override those styles with your own, setting the box-shadow to none and adjusting the border-color to match your default.
As for the select box, you can use the following style, as was originally mentioned by #kamlesh-kushwaha, to override the bootstrap setting:
.bootstrap-select .btn:focus {
outline: none !important;
}

Answer 2

For <select> dropdown, change in bootstrap-select.min line 29:
.bootstrap-select .dropdown-toggle:focus {
outline: thin dotted #333 !important;
outline: 5px auto -webkit-focus-ring-color !important;
outline-offset: -2px;}
to:
.bootstrap-select .dropdown-toggle:focus {
outline: none!important;
}

Answer 3

I remove bootstrap 4 dropdown-toggle 'on click' blue borders by doing this:
.yourdivname:focus {
box-shadow: none;
}
Anything else seemed to be irrelevant. For instance, with normal buttons {outline: none} always seemed to work, but not for this element. All that was needed was the box-shadow:none property.

Answer 4

Add the css focus rule or modify the existing one.
.bootstrap-select .btn:focus{outline:none!important;}
Similarly, you can add for select

Answer 5

You can use input[type] {}
All bootstrap input type as below
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: rgba(126, 239, 104, 0.8);
/* give your style */
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(255, 0, 0, 0.6);
/* give your style */
outline: 0 none;
/* give your style */
}
select:focus {
outline-color: transparent;
}

Answer 6

Bootstrap or not, you can remove the the outline from a select tag with with:
select:focus {
box-shadow: none;
}