style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;200;300;400;500;600;700;800;900&display=swap');

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

section{
  padding: 20px 100px;
}

.section-home{
  position: relative;
  min-height: 100vh;
  background: url(https://i.pinimg.com/564x/6a/c4/ca/6ac4cac86ace393ba37eda37a47289fb.jpg)no-repeat;
  background-size: cover;
  background-position: center;
  display: flex;
  justify-content: center;
  align-items: center;
}

.section-home:before{
  content: '';
  position: absolute;
  background: linear-gradient(to top, #23252B, transparent);
  width: 100%;
  height: 80px;
  bottom: 0;
}

.section-home h1{
  color: #fff;
  font-size: 10vw;
  font-weight: 800;
  text-shadow: 0 5px 25px rgb(0 0 0 / 20%);
  opacity: 0.3;
}

.section-two{
position: center;
  min-height: 100vh;
  background: #23252B;
}

.section-two h2{
  color: #fff;
  font-size: 3em;
  font-weight: 700;
  margin: 30px 0;
}

.section-two p{
  color: #fff;
  font-size: 1em;
  margin: 30px 0;
}

header{
  z-index: 999;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #23252B;
  box-shadow: 0 5px 25px rgb(0 0 0 / 20%);
  padding: 0 100px;
  transition: 0.6s;
}

header .logo{
  color: #fff;
  font-size: 1.8em;
  font-weight: 700;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 2px;
}

header .navigation{
  position: relative;
  line-height: 75px;
  transition: 0.6s;
  transition-property: line-height;
}

header.sticky .navigation{
  line-height: 60px;
}

header .navigation .menu{
  position: relative;
  display: flex;
  justify-content: center;
  list-style: none;
  user-select: none;
}

.menu-item > a{
  color: #fff;
  font-size: 1em;
  text-decoration: none;
  margin: 20px;
  padding: 25px 0;
}

.menu-item > a:hover{
  color: #469DFF;
  transition: 0.3s;
}

.menu-item .sub-menu{
  position: absolute;
  background: #23252B;
  top: 74px;
  line-height: 40px;
  list-style: none;
  border-radius: 0 0 8px 8px;
  box-shadow: 0 5px 25px rgb(0 0 0 / 20%);
  pointer-events: none;
  transform: translateY(20px);
  opacity: 0;
  transition: 0.3s;
  transition-property: transform, opacity;
}

header.sticky .menu-item .sub-menu{
  top: 60px;
}

.menu-item:hover .sub-menu{
  pointer-events: all;
  transform: translateY(0);
  opacity: 1;
}

.menu-item .sub-menu .sub-item{
  position: relative;
  padding: 7px 0;
  cursor: pointer;
  box-shadow: inset 0px -30px 5px -30px rgba(255, 255, 255, 0.2);
}

.menu-item .sub-menu .sub-item a{
  color: #fff;
  font-size: 1em;
  text-decoration: none;
  padding: 15px 30px;
}

.menu-item .sub-menu .sub-item:hover{
  background: #4080EF;
}

.menu-item .sub-menu .sub-item:last-child:hover{
  border-radius: 0 0 8px 8px;
}

.more .more-menu{
  position: absolute;
  background: #23252B;
  list-style: none;
  top: 0;
  left: 100%;
  white-space: nowrap;
  border-radius: 0 8px 8px 8px;
  overflow: hidden;
  pointer-events: none;
  transform: translateY(20px);
  opacity: 0;
  transition: 0.3s;
  transition-property: transform, opacity;
}

.more:hover .more-menu{
  pointer-events: all;
  transform: translateY(0);
  opacity: 1;
}

.more .more-menu .more-item{
  padding: 7px 0;
  box-shadow: inset 0px -30px 5px -30px rgba(255, 255, 255, 0.2);
  transition: 0.3s;
}

.more .more-menu .more-item:hover{
  background: #4080EF;
}

.menu-btn{
  display: none;
}

@media (max-width: 1060px){
  header .navigation .menu{
    position: fixed;
    display: block;
    background: #23252b;
    min-width: 350px;
    height: 100vh;
    top: 0;
    right: -100%;
    padding: 90px 50px;
    visibility: hidden;
    overflow-y: auto;
    transition: 0.5s;
    transition-property: right, visibility;
  }

  header.sticky .navigation{
    line-height: 75px;
  }

  header .navigation .menu.active{
    right: 0;
    visibility: visible;
  }

  .menu-item{
    position: relative;
  }

  .menu-item .sub-menu{
    opacity: 1;
    position: relative;
    top: 0;
    transform: translateX(10px);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
    display: none;
  }

  header.sticky .menu-item .sub-menu{
    top: 0;
  }

  .menu-item:hover .sub-menu{
    transform: translateX(10px);
  }

  .menu-item .sub-menu .sub-item{
    box-shadow: none;
  }

  .menu-item .sub-menu .sub-item:hover{
    background: none;
  }

  .menu-item .sub-menu .sub-item a:hover{
    color: #4080EF;
    transition: 0.3s;
  }

  .more .more-menu{
    opacity: 1;
    position: relative;
    left: 0;
    transform: translateY(0);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    display: none;
  }

  .more .more-menu .more-item{
    box-shadow: none;
  }

  .more .more-menu .more-item:hover{
    background: none;
  }

  .more .more-menu .more-item a{
    margin-left: 20px;
  }

  .close-btn{
    position: absolute;
    background: url(close.png)no-repeat;
    width: 40px;
    height: 40px;
    background-size: 25px;
    background-position: center;
    top: 0;
    left: 0;
    margin: 25px;
    cursor: pointer;
  }

  .menu-btn{
    background: url(menu.png)no-repeat;
    width: 40px;
    height: 40px;
    background-size: 30px;
    background-position: center;
    cursor: pointer;
    display: block;
  }

  header{
    padding: 15px 20px;
  }

  header.sticky{
    padding: 10px 20px;
  }
}