CODE EXAMPLE FOR CSS

remove input border on focus

.bootstrap-select .form-control:focus {
    outline: 0px none #fff !important;
}

.bootstrap-select .form-control > div.filter-option:focus {
    outline: 0px none #fff !important;
}

.bootstrap-select .form-control > div.filter-option > div.filter-option-inner:focus {
    outline: 0px none #fff !important;
}

.bootstrap-select .form-control > div.filter-option > div.filter-option-inner > div.filter-option-inner-inner:focus {
    outline: 0px none #fff !important;
}