How to pass a style from one component to another if condition is true in Vue 3

I have two sibling components where one relies on the other for an event to happen. In this case, I want to apply this styling - marginTop = "-20px"; to the div of one component when the length of an input inside another component is more than 0 characters.

Whether it be props, slots, refs or events, I'm still not sure what fits this use case (I'm very new to Vue). I'm also not sure if I can even pass data between these two sibling components directly or if I have to pass from one child to the parent and then to the other child.

What I'm currently attempting to do is to simply grab the element I want to apply the style to (in the vanilla JS way) and have the method invoked when the aforementioned condition becomes true (all in the same component).

// Component trying to style the element
<ais-state-results v-if="input.length > 0">

// Component trying to style the element
mounted() {
      this.positionSecondaryContent();
},
methods: {
  positionSecondaryContent() {
  const secondaryContent = document.querySelector('.secondary-content');
  secondaryContent.style.marginTop = "-20px";
  }
},

// Component that has the element to be styled
<template>
  <div class="secondary-content">
    <TheWordOfTheDay />
    <SuggestTranslationForm />
  </div>
</template>

Aside from not knowing if I really should be communicating with other components, I'm not sure what to write in the ais-state-results component instance above to attach it to my method and then have the method run as soon as the condition is met.

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