.mpfilter-search,
.mpfilter-search .cf-searchmod-wrapper,
.mpfilter-search .input-append {
    display: flex;
    width: 100%;
    min-width: 0;
}

.mpfilter-search .input-append {
    position: relative;
    align-items: center;
}

.mpfilter-search input[type="search"] {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
    padding-right: 52px;
}

.mpfilter-search span.input-append button.btn.btn-primary.cf_apply_button {
    position: absolute;
    right: 5px;
    top: 5px;
    transform: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    background: none;
    color: #09334e;
    box-shadow: none;
}

/* The header is a flex row. Let this module occupy its available middle cell. */
#block5 [data-position="head-2"] > :has(.mpfilter-search) {
    flex: 1 1 360px;
    min-width: 180px;
}