Disable Box Shadow Bootstrap

Add this line in your CSS file to disable box shadow or inset shadow Boostrap forms

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 {
  outline: none;
  border: 1px solid #545454;
  -webkit-box-shadow: none !important;
  -moz-box-shadow: none !important;
  box-shadow: none !important;
}
.form-control {
  display: block;
  width: 100%;
  height: 34px;
  padding: 6px 12px;
  font-size: 14px;
  line-height: 1.42857143;
  color: #555;
  background-color: #fff;
  border: 1px solid #c0c0c0;
  border-radius: 2px;
  -webkit-box-shadow: none;
          box-shadow: none;
  -webkit-transition: none;
       -o-transition: none;
          transition: none;
}
.form-control:focus {
    border: 1px solid #545454;
  outline: 0;
  -webkit-box-shadow: none;
          box-shadow: none;
}

Happy Coding