Почему не отображается SVG спрайт подключенный через css?

//Код спрайта

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.section-list {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.list-item {
  position: relative;
  max-width: 33.333%;
  padding-left: 6rem;
  padding-bottom: 10rem;
}

.list-item:nth-child(1n+4) {
  padding-bottom: 0;
}

.list-item__icon--clock::before,
.list-item__icon--graph::before,
.list-item__icon--computer::before,
.list-item__icon--book::before,
.list-item__icon--home::before,
.list-item__icon--frame::before {
  content: "";
  background-image: url('../img/icons-sprite.svg#icon-clock');
  background-repeat: no-repeat;
  height: 50px;
  width: 50px;
  position: absolute;
  left: 0;
  top: 3px;
}

.list-item__icon--clock::before {
  background-image: url('../img/icons-sprite.svg#icon-clock');
}

.list-item__icon--graph::before {
  background-image: url('../img/icons-sprite.svg#icon-graph');
}

.list-item__icon--computer::before {
  background-image: url('../img/icons-sprite.svg#icon-computer');
}

.list-item__icon--book::before {
  background-image: url('../img/icons-sprite.svg#icon-book');
}

.list-item__icon--home::before {
  background-image: url('../img/icons-sprite.svg#icon-home');
}

.list-item__icon--frame::before {
  background-image: url('../img/icons-sprite.svg#icon-frame');
}

.list-item__name {
  font-size: 1.4rem;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 2rem;
}

.list-item__text {
  font-family: 'Roboto', sans-serif;
  font-size: 1.5rem;
  font-weight: 400;
  color: #b3b3b3;
  line-height: 2.6rem;
}

<section class="section-list">
  <div class="list-item list-item__icon--clock">
    <h2 class="list-item__name">PHOTOGRAPHY</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
  <div class="list-item list-item__icon--graph">
    <h2 class="list-item__name">WEB DESIGN</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
  <div class="list-item list-item__icon--computer">
    <h2 class="list-item__name">CREATIVITY</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
  <div class="list-item list-item__icon--book">
    <h2 class="list-item__name">SEO</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
  <div class="list-item list-item__icon--home">
    <h2 class="list-item__name">CSS/HTML</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
  <div class="list-item list-item__icon--frame">
    <h2 class="list-item__name">DIGITAL</h2>
    <p class="list-item__text">Lorem ipsum dolor sit, amet consectetur adipisicing elit. Voluptatem omnis nulla fuga.</p>
  </div>
</section>