如何在菜单打开时更改 Font Awesome 图标的颜色？

.container {
  wIDth: 300px;
  margin: auto;
}

#options li {
  text-decoration: none;
}

#options:hover {
  BACkground-color: #254574;
  color: white;
}

.elem {
  List-style: none;
}

.show-modal {
  border-radius: 25px;
  padding: 5px;
}

.show-modal:hover {
  BACkground-color: grey;
}

.options {
  position: absolute;
  BACkground-color: white;
  cursor: pointer;
  color: #091f43;
  line-height: 2rem;
  height: 2rem;
  wIDth: 2rem;
  Font-size: 0.9rem;
  display: none;
  margin-top: 15px;
}

.modifIEr-checkBox:checked~.options {
  display: flex;
  flex-direction: column;
  wIDth: 100px;
  z-index: 4;
}

.elem {
  BACkground-color: white;
}

.modifIEr-checkBox {
  opacity: 0;
}

.card {
  display: flex;
  flex-direction: column;
  Box-shadow: 0 0 1rem 0 rgba(0,0.2);
  border-radius: 5px;
  BACkground: inherit;
  margin-bottom: 2rem;
  position: relative;
  &::before {
    content: "";
    position: absolute;
    BACkground: inherit;
    z-index: -1;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    Box-shadow: inset 0 0 2000px rgba(255,255,0.5);
    filter: blur(10pX);
    margin: -20px;
  }
}

.header-card {
  padding: 0.8rem 1rem 0.5rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: $border;
}

.author {
  display: flex;
  Font-weight: bold;
  Font-size: 0.94rem;
  color: #091f43;
}

.date {
  display: flex;
  Font-size: 0.75rem;
  color: #0000007e;
}

.content {
  Font-size: 0.94rem;
  display: flex;
  padding: 1rem 1rem 1.15rem 1rem;
}

.img-card {
  position: relative;
  display: inline-block;
  img {
    display: block;
    wIDth: 100%;
    object-fit: contain;
  }
}

.flex-right {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.fa-tag {
  margin-right: 0.4rem;
}

.tag {
  cursor: default;
  Font-size: 0.75rem;
  padding: 0.3rem 0.8rem;
  margin-right: 15px;
  Font-weight: bold;
  text-transform: cAPItalize;
  BACkground-color: blue;
  color: white;
  Box-shadow: 12px 12px 16px 0 rgba(0,0.112),-8px -8px 12px 0 rgba(149,142,216,0.057);
  border-radius: 50px;
}

.likebar {
  display: flex;
  justify-content: space-between;
}@H_419_11@
<link href="https://cdnjs.cloudFlare.com/AJAX/libs/Font-awesome/5.15.3/CSS/all.min.CSS" rel="stylesheet" />
<div class="container">
  <div class="card">
    <div class="header-card">
      <div class="column">
        <p class="author">auteur</p>
        <p class="date">date</p>
      </div>
      <div class="flex-right">
        <p v-if="tag" class="tag">
          <i class="icon-tag fas fa-tag"></i>tag
        </p>
        <div class="modifIEr-toggle">
          <input type="checkBox" name="toggle" ID="modifIEr-checkBox-1" class="modifIEr-checkBox" />

          <label for="modifIEr-checkBox-1" class="modifIEr-toggle">
             <i class="show-modal fas fa-ellipsis-h"></i>
           </label>

          <ul class="options">
            <li class="elem">ModifIEr</li>
            <li class="elem">Supprimer</li>
          </ul>
        </div>
      </div>
    </div>
  </div>
</div>@H_419_11@