@media screen and (max-width:767px) {
    .c-input-group {
        flex-wrap: wrap;
    }

    .c-input-group__addon {
        width: calc(100% - .07rem);
        border-right: 1px solid #ccc !important;
        border-bottom: none;
        border-radius: 6px 6px 0 0 !important;
    }

    .c-input-group__field {
        border-radius: 0 0 0 6px !important;
    }

    .c-input-group>:last-child {
        border-radius: 0 0 6px 0 !important;
    }

    .c-input-group__field:not(:first-child):not(:last-child)>input {
        border-radius: 0 0 0 6px!important;
    }
}