style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
  text-decoration: none;
}

html, body {
  width: 100%;
  height: 100%;
  color: #dfdbdb;
}

.not-mobile{
  display: none;
}

.active {
  display: none;
}

video {
  position: fixed;
  z-index: -1;
}

.top-btn{
  position: fixed;
  bottom: 50px;
  right: 75px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #121212;
  border: 2px solid #c0c0c0;
  z-index: 10;
  cursor: pointer;
  transition: transform 0.4s ease-in-out;
  display: none;
}

.top-btn:hover{
  transform: scale(1.2);
}

.top-btn span {
  position: absolute;
  top: 24%;
  left: 24%;
}

.background {
  background-color: #000000 !important;
}

.home {
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.8);
}

.navbg {
  transition: all 1s;
  background-color: #000000;
}

.navbar {
  position: fixed;
  width: 100%;
  display: flex;
  justify-content: space-between;
  z-index: 10;
}

.navbar-items{
  display: flex;
}

.navbar-item {
  padding: 2em 3em;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  transition: all 0.3s ease-in-out;
}

.navbar-item:hover {
  color: #ffffff;
  transform: scale(1.2);
}

.navbar-item a {
  color: #dfdbdb;
  
}

.video-icon {
  transition: all 0.4s ease-in-out;
  cursor: pointer;
}

.video-icon:hover{
  color: #ffffff;
  transform: scale(1.2);
}

.centerbar {
  position: absolute;
  top: 60%;
  transform: translateY(-50%);
  width: 100%;
  display: flex;
  justify-content: space-around;
  z-index: 2;
}

.centerbar-item:nth-child(1) {
  background: #121212;
  font-weight: 300;
  text-transform: uppercase;
  width: 240px;
  height: 280px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #c0c0c0;
  position: relative;
  left: -100px;
  text-align: center;
  line-height: 1.7;
  border: 1px solid #c0c0c0;
}

.centerbar-item:nth-child(2) {
  transform: rotate(-90deg);
  position: relative;
  top: -150px;
  left: 30px;
  font-weight: 300;
}

.bottombar {
  position: absolute;
  bottom: 0;
  width: 40%;
  display: flex;
  justify-content: space-between;
}

.bottombar-item {
  padding: 2em;
  font-weight: 700;
}

.header {
  position: absolute;
  right: 80px;
  bottom: -210px;
  z-index: 2;
  user-select: none;
}

.header-item {
  color: #dfdbdb;
  font-weight: 900;
  font-size: 580px;
  -webkit-text-stroke: 15px #dfdbdb;
}

.header-container {
  display: flex;
}

.img-one {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 280px;
  height: 340px;
  background: url("src/img-two.jpg") no-repeat 50% 50%;
  background-size: cover;
}

.img-two {
  position: absolute;
  top: 25%;
  right: 0;
  width: 640px;
  height: 400px;
  background: url("src/img-one.jpg") no-repeat 50% 50%;
  background-size: cover;
}

.img-three {
  position: absolute;
  left: 72%;
  bottom: 0;
  transform: translateX(-50%);
  z-index: 2;
  width: 190px;
  height: 210px;
  background: url("src/img-three.jpg") no-repeat 50% 50%;
  background-size: cover;
}

.about {
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.8);
  position: relative;
}

.img-slide-box {
  top: 160px;
  left: 140px;
  position: absolute;
  width: 1080px;
  height: 580px;
  overflow: hidden;
  z-index: 5;
  border: 1px solid #c0c0c07e;
}

.img-box {
  width: 4320px;
  height: 580px;
  display: flex;
}

.tab-box{
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 7;
  border: 1px solid #c0c0c0b8;
  font-family: 'Noto Sans KR', sans-serif;
}

.main {
  display: flex;
  justify-content: center;
}

.tabs {
  width: 100%;
  display: flex;
  justify-content: space-evenly;
}

.tabs .tab {
  width: 100%;
  height: 60px;
  background-color: #121212;
  color: #c0c0c0;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
}

.items {
  width: 620px;
  height: 330px;
  background-color: #121212;
  color: #c0c0c0;
  position: relative;
  line-height: 2;
  display: none;
}

.text-wrap{
  width: 100%;
  height: 100%;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  padding-left: 55px;
  line-height: 1.5;
}

.text-1 {
  width: 25%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.text-1 h3 {
  font-size: 24px;
}

.text-4 {
  line-height: 1.5;
}

.text-5 {
  line-height: 3;
}

.text-5 img {
  width: 87%;
}

.items::before{
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  width: 150px;
  height: 3px;
  background-color: #595959;
}

.items:nth-child(2):before {
  left: 235px;
}

.items:nth-child(3):before {
  left: 440px;
}

.tab-active {
  display: block;
}

.contact {
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.8);
  position: relative;
}

h2 {
  width: 50%;
  position: absolute;
  top: 18%;
  right:15%;
  font-weight: 900;
  font-size: 120px;
  line-height: 1.3;
  z-index: 3;
}

.contact-box{
  width: 20%;
  height: 20%;
  position: absolute;
  right: 10%;
  bottom: 15%;
  z-index: 3;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.contact-box a {
  width: 130px;
  height: 60px;
  border: 1px solid #c0c0c0;
  border-radius: 50% 50% 50% 50%;
  color: #c0c0c0;
  transition: all 0.3s ease-in-out;
  display: flex;
  justify-content: center;
  align-items: center;
}

.contact-box a:hover{
  color: #fff;
  border: 1px solid #fff;
  transform: scale(1.2);
}

.contact-img {
  width: 50%;
  height: 50%;
  top: 15%;
  position: relative;
}

.contact-img-1 {
  position: absolute;
  left: 35%;
  transform: translateX(-50%);
  width: 280px;
  height: 320px;
  background: url("src/contact-1.jpg") no-repeat 50% 50%;
  background-size: cover;
  z-index: 1;
}

.contact-img-2 {
  position: absolute;
  top: 35%;
  left: 65%;
  transform: translateX(-50%);
  width: 450px;
  height: 540px;
  background: url("src/contact-2.jpg") no-repeat 50% 50%;
  background-size: cover;
}


@media (max-width: 1050px) {
  body {
    background-color: #000000;
  }
  
  video {
    display: none;
  }

  .navbar {
    justify-content: center;
  }

  .navbar .logo {
    display: none;
  }

  .header {
    position: absolute;
    right: 10px;
    bottom: -170px;
    z-index: 2;
  }
  
  .header-item {
    color: #dfdbdb;
    font-weight: 900;
    font-size: 450px;
    -webkit-text-stroke: 15px #dfdbdb;
  }
  
  .header-container {
    display: flex;
  }

  .img-slide-box {
    left: 0;
  }
  
  .tab-box{
    left: 35%;
  }

  h2 {
    font-size: 90px;
  }
}

@media (max-width: 800px) {

  .top-btn{
    display: none;
  }
  
  .centerbar-item:nth-child(1) {
    background: transparent;
    left: 10px;
  }
  
  .centerbar-item:nth-child(2) {
    top: -150px;
    left: 90px;
  }
  
  .bottombar {
    display: none;
  }

  .header {
    right: 20px;
    bottom: -115px;
  }
  
  .header-item {
    font-size: 300px;
  }
  
  .img-one {
    width: 280px;
    height: 340px;
  }
  
  .img-three {
    left: 72%;
    bottom: 0;
    height: 248px;
  }
  
  .img-slide-box {
    left: 0;
  }
  
  .tab-box{
    left: 0;
  }
}

@media (max-width: 490px) {
  .not-mobile {
    display: block;
    width: 100%;
    height: 100vh;
    background-color: #000000;
    z-index:20;
  }

  .not-mobile .text-wrap {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .not-mobile p {
    font-weight: 700;
  }

  .home {
    display: none;
  }

  .about {
    display: none;
  }
  
  .contact {
    display: none;
  }
}