header {
  padding-bottom: 350px;
}
.course-div {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  gap: 20px;
}
.course-div > * {
  text-decoration: none;
  -o-transition-property: all;
  -webkit-transition-property: all;
  transition-property: all;
  -o-transition-duration: 0.3s;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
}
.course-div img {
  border-radius: 400px;
  width: 100%;
  -webkit-filter: grayscale(0.8);
          filter: grayscale(0.8);
}
.course-div strong {
  opacity: 0.2;
}
.course-swiper .swiper-slide-active .course-div strong {
  opacity: 1;
}
.course-swiper .swiper-slide-active .course-div img {
  -webkit-box-shadow: 0px 0px 10px 2px #0000009e;
  box-shadow: 0px 0px 10px 2px #0000009e;
  -webkit-filter: none;
          filter: none;
}
.course-swiper .swiper-button-prev,
.course-swiper .swiper-button-next {
  top: 45%;
}
.unset-swiper {
  position: unset;
}
.swiper-button-next,
.swiper-button-prev {
  -webkit-transform: translateY(-50%);
      -ms-transform: translateY(-50%);
          transform: translateY(-50%);
}
.swiper-button-next {
  left: -24px !important;
}
.swiper-button-prev {
  right: -24px !important;
}
.comment-div {
  background-image: url("../image/comments.jpg");
}
.comment-owner {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  width: 100%;
  color: var(--primary-color);
  font-size: 50px;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: start;
  line-height: 1;
}
.line-title::after {
  content: "";
  display: block;
  width: 30px;
  height: 2px;
  background-color: var(--primary-color);
}
.comment-owner img {
  width: 50px;
  border-radius: 50px;
}
.comment-owner > div {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 12px;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  margin-bottom: 12px;
}
.header-back {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
  -webkit-animation: rotate-center 100s linear infinite both;
  animation: rotate-center 100s linear infinite both;
  z-index: -1;
  opacity: 0.2;
}
@-webkit-keyframes rotate-center {
  0% {
    -webkit-transform: rotate(0);
    transform: rotate(0);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes rotate-center {
  0% {
    -webkit-transform: rotate(0);
    transform: rotate(0);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}