.preloader {

  /* Фиксируем блок на всю ширину и высоту окна, чтобы перекрывать все остальные элементы */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;

  /* Центрируем анимацию Preloader */
  display: flex;
  align-items: center;
  justify-content: center;

  /* При загрузке страницы, Preloader сразу отображается */
  opacity: 1;
  visibility: visible;

  /* Добавляем затемнение */
  background: rgba(18,18,18,1);

  /* Добавляем плавный переход */
  transition: opacity 1s, visibility 0s 0s;
}

/* Класс для скрытия Preloader */
.preloader_hidden {
  visibility: hidden;
  opacity: 0;
  transition: opacity 1s, visibility 0s 1s;
}

/* Скопированый код анимации Preloader */
.sk-chase {
  width: 128px;
  height: 128px;
  position: relative;
  -webkit-animation: sk-chase 2.5s infinite linear both;
  animation: sk-chase 2.5s infinite linear both;
}
.sk-chase-dot {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  -webkit-animation: sk-chase-dot 2s infinite ease-in-out both;
  animation: sk-chase-dot 2s infinite ease-in-out both;
}
.sk-chase-dot:before {
  content: '';
  display: block;
  width: 25%;
  height: 25%;
  background-color: #f4c430;
  border-radius: 100%;
  -webkit-animation: sk-chase-dot-before 2s infinite ease-in-out both;
  animation: sk-chase-dot-before 2s infinite ease-in-out both;
}
.sk-chase-dot:nth-child(1) {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
.sk-chase-dot:nth-child(2) {
  -webkit-animation-delay: -1s;
  animation-delay: -1s;
}
.sk-chase-dot:nth-child(3) {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
.sk-chase-dot:nth-child(4) {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
.sk-chase-dot:nth-child(5) {
  -webkit-animation-delay: -0.7s;
  animation-delay: -0.7s;
}
.sk-chase-dot:nth-child(6) {
  -webkit-animation-delay: -0.6s;
  animation-delay: -0.6s;
}
.sk-chase-dot:nth-child(1):before {
  -webkit-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
.sk-chase-dot:nth-child(2):before {
  -webkit-animation-delay: -1s;
  animation-delay: -1s;
}
.sk-chase-dot:nth-child(3):before {
  -webkit-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
.sk-chase-dot:nth-child(4):before {
  -webkit-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
.sk-chase-dot:nth-child(5):before {
  -webkit-animation-delay: -0.7s;
  animation-delay: -0.7s;
}
.sk-chase-dot:nth-child(6):before {
  -webkit-animation-delay: -0.6s;
  animation-delay: -0.6s;
}
@-webkit-keyframes sk-chase {
  100% {
    transform: rotate(360deg);
  }
}
@keyframes sk-chase {
  100% {
    transform: rotate(360deg);
  }
}
@-webkit-keyframes sk-chase-dot {
  80%, 100% {
    transform: rotate(360deg);
  }
}
@keyframes sk-chase-dot {
  80%, 100% {
    transform: rotate(360deg);
  }
}
@-webkit-keyframes sk-chase-dot-before {
  50% {
    transform: scale(0.4);
  }
  100%, 0% {
    transform: scale(1);
  }
}
@keyframes sk-chase-dot-before {
  50% {
    transform: scale(0.4);
  }
  100%, 0% {
    transform: scale(1);
  }
}