.select2-container--bootstrap4 {
    width: 100% !important;
}

    .select2-container--bootstrap4 .select2-selection--single {
        height: calc(2.25rem + 2px) !important;
    }

        .select2-container--bootstrap4 .select2-selection--single .select2-selection__placeholder {
            color: #757575;
            line-height: 2.25rem;
        }

        .select2-container--bootstrap4 .select2-selection--single .select2-selection__arrow {
            position: absolute;
            top: 50%;
            right: 3px;
            width: 20px;
        }

            .select2-container--bootstrap4 .select2-selection--single .select2-selection__arrow b {
                top: 60%;
                border-color: #343a40 transparent transparent transparent;
                border-style: solid;
                border-width: 5px 4px 0 4px;
                width: 0;
                height: 0;
                left: 50%;
                margin-left: -4px;
                margin-top: -2px;
                position: absolute;
            }

        .select2-container--bootstrap4 .select2-selection--single .select2-selection__rendered {
            line-height: 2.25rem;
        }

.select2-search--dropdown .select2-search__field {
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
}

.select2-results__message {
    color: #6c757d;
}

.select2-container--bootstrap4 .select2-selection--multiple {
    min-height: calc(2.25rem + 2px) !important;
}

    .select2-container--bootstrap4 .select2-selection--multiple .select2-selection__rendered {
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
        list-style: none;
        margin: 0;
        padding: 0 5px;
        width: 100%;
    }

    .select2-container--bootstrap4 .select2-selection--multiple .select2-selection__choice {
        color: #343a40;
        border: 1px solid #bdc6d0;
        border-radius: 0.2rem;
        padding: 0;
        padding-right: 5px;
        cursor: pointer;
        float: left;
        margin-top: 0.3em;
        margin-right: 5px;
    }

    .select2-container--bootstrap4 .select2-selection--multiple .select2-selection__choice__remove {
        color: #bdc6d0;
        font-weight: bold;
        margin-left: 3px;
        margin-right: 1px;
        padding-right: 3px;
        padding-left: 3px;
        float: left;
    }

        .select2-container--bootstrap4 .select2-selection--multiple .select2-selection__choice__remove:hover {
            color: #343a40;
        }

.select2-container *:focus {
    outline: 0;
}

.select2-container--bootstrap4 .select2-selection {
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    width: 100%;
}

.select2-container--bootstrap4.select2-container--focus .select2-selection {
    border-color: #17a2b8;
    -webkit-box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.select2-container--bootstrap4.select2-container--focus.select2-container--open .select2-selection {
    border-bottom: none;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

select.is-invalid ~ .select2-container--bootstrap4 .select2-selection {
    border-color: #dc3545;
}

select.is-valid ~ .select2-container--bootstrap4 .select2-selection {
    border-color: #28a745;
}

.select2-container--bootstrap4 .select2-dropdown {
    border-color: #ced4da;
    border-top: none;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

    .select2-container--bootstrap4 .select2-dropdown .select2-results__option[aria-selected=true] {
        background-color: #e9ecef;
    }

.select2-container--bootstrap4 .select2-results__option--highlighted,
.select2-container--bootstrap4 .select2-results__option--highlighted.select2-results__option[aria-selected=true] {
    background-color: #007bff;
    color: #f8f9fa;
}

.select2-container--bootstrap4 .select2-results__option[role=group] {
    padding: 0;
}

.select2-container--bootstrap4 .select2-results__options {
    max-height: 15em;
    overflow-y: auto;
}

.select2-container--bootstrap4 .select2-results__group {
    padding: 6px;
    display: list-item;
    color: #6c757d;
}

.select2-container--bootstrap4 .select2-selection__clear {
    width: 1.2em;
    height: 1.2em;
    line-height: 1.15em;
    padding-left: 0.3em;
    margin-top: 0.5em;
    border-radius: 100%;
    background-color: #6c757d;
    color: #f8f9fa;
    float: right;
    margin-right: 0.3em;
}

    .select2-container--bootstrap4 .select2-selection__clear:hover {
        background-color: #343a40;
    }