<div class="form-label-group">
<input type="password" id="inputPassword" class="form-control shadow-none" placeholder="Password" required>
<label for="inputPassword">Password</label>
</div>
<span class="border">Text</span>
<span class="border-top">Text</span>
<span class="border-right">Text</span>
<span class="border-bottom">Text</span>
<span class="border-left">Text</span>
textarea:focus,
textarea.form-control:focus,
input.form-control:focus,
button.btn:focus,
button.btn:active,
input[type=text]:focus,
input[type=password]:focus,
input[type=email]:focus,
input[type=number]:focus,
[type=text].form-control:focus,
[type=password].form-control:focus,
[type=email].form-control:focus,
[type=tel].form-control:focus,
[contenteditable].form-control:focus {
box-shadow: inset 0 -1px 0 #ddd;
outline: none !important;
}<button class="btn btn-success shadow-none"> The Solution </button>
"shadow-none" class for {outline: none;}