hugo-theme-relearn/css/auto-complete.css

.autocomplete-suggestions {
    text-align: start;
    cursor: default;
    border: 1px solid #ccc;
    border-top: 0;
    background: #fff;
    box-shadow: -1px 1px 3px rgba(0,0,0,.1);

    /* core styles should not be changed */
    position: absolute;
    display: none;
    z-index: 9999;
    max-height: 150px;
    max-height: calc( 100vh - 150px );
    overflow: hidden;
    overflow-y: auto;
    box-sizing: border-box;
}
.autocomplete-suggestion {
    position: relative;
    cursor: pointer;
    padding: 7px;
    line-height: 23px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #282828;
}

.autocomplete-suggestion b {
    font-weight: normal;
    color: #1f8dd6;
}

.autocomplete-suggestion.selected {
    background: #282828;
    color: #fff;
}

.autocomplete-suggestion:hover,
.autocomplete-suggestion:focus,
.autocomplete-suggestion:active,
.autocomplete-suggestion:hover > .context,
.autocomplete-suggestion:focus > .context,
.autocomplete-suggestion:active > .context,
#searchresults .autocomplete-suggestion:hover > .context,
#searchresults .autocomplete-suggestion:focus > .context,
#searchresults .autocomplete-suggestion:active > .context {
    background: #383838;
    color: #fff;
}

.autocomplete-suggestion > .context {
    font-size: 12px;
    margin-inline-start: 1em;
    overflow: hidden;
    text-overflow: ellipsis;
}