.custom-combobox {
        position: relative;
    }

    .custom-combobox-toggle {
        position: absolute;
        top: 0;
        bottom: 0;
        margin-left: -1px;
        padding: 0;
        right: 0;
        width: 21px;
        height: 16px;
        background: none;
        border: none;
    }

    .input-validation-error.custom-combobox-toggle
    {
        opacity: 0;
    }

    .custom-combobox-input {
        width: 100%;
    }