JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hi-call-button1-3" class="brz-css-uiyth brz-wrapper"><div class="brz-d-xs-flex brz-css-qllru"><div class="brz-rich-text brz-css-tuigc" data-custom-id="vgqcolqiepoliqsomiyljswpbpwviqeqybcq"><p class="brz-fs-sm-17 brz-lh-lg-1_9 brz-lh-sm-im-1_6 brz-lh-xs-im-1_6 brz-ls-lg-0 brz-ls-sm-im-0 brz-ls-xs-im-0 brz-ff-overpass brz-ft-google brz-fw-lg-400 brz-fw-sm-im-400 brz-fw-xs-im-400 brz-text-lg-justify brz-text-xs-center brz-text-sm-right brz-fs-lg-24 brz-fs-xs-im-23"><a href="tel:+18333580460" style="color: rgb(0, 0, 0);" class="link--external" data-brz-link-type="external">+1 (833) 358-0460</a></p></div></div></div>


<div id="hi-call-button1-2" class="brz-css-smmlg brz-wrapper"><div class="brz-d-xs-flex brz-css-fadlw brz-css-tlsel"><div class="brz-rich-text brz-css-hwydy" data-custom-id="vgqcolqiepoliqsomiyljswpbpwviqeqybcq"><p class="brz-fs-xs-22 brz-text-lg-right brz-text-xs-center brz-ls-xs-im-0 brz-ls-sm-im-0 brz-ls-lg-0 brz-lh-xs-im-1_6 brz-lh-sm-im-1_6 brz-lh-lg-1_9 brz-fs-sm-17 brz-ff-overpass brz-ft-google brz-fw-lg-400 brz-fw-sm-im-400 brz-fw-xs-im-400 brz-fs-lg-24 brz-text-sm-right"><a href="tel:+18333580460" style="color: rgb(0, 0, 0);" class="link--external" data-brz-link-type="external">+1 (833) 358-0460</a></p></div></div></div>

CSS

div[id^="hi-call-button1"] {
    text-decoration: underline;
}