html::before,
html::after{
  content: '';
  position: fixed;
  z-index: -2;
  border-radius: 50%;
}
html::before{
  height: 100px;
  width: 100px;
  top: 20%;
  left: calc(50% - 650px);
  background-image: linear-gradient(to right bottom, var(--decoration-bg-color-1), var(--WHITE));
}
html::after{
  height: 150px;
  width: 150px;
  bottom: 20%;
  right: calc(50% - 675px);
  background-image: linear-gradient(to left bottom, var(--decoration-bg-color-2), var(--WHITE));
}

body{
  --white: hsla(0, 0%, 100%, 0.25);
  --border-color-2: hsla(0, 0%, 100%, 0.40);
  --shadow: none;
  --border-color-1: hsl(0, 0%, 0%, 0.1);
  background-image: linear-gradient(to right, var(--body-gradient-bg-color-1), var(--body-gradient-bg-color-2));
  background-attachment: fixed;
  padding: 40px 0;
  --backdrop-filter-blur: blur(5px);
}
/* control lightness using using opacity property */
body::before{
  content: '';
  position: fixed;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: var(--WHITE);
  opacity: 0.3;
  z-index: -3;
}
.main-wrapper{
  max-width: 1200px;
  background-color: var(--white);
  border: 1px solid var(--border-color-2);
  margin: auto;
  border-radius: 20px;
  position: relative;
}
.main-wrapper::before{
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  -webkit-backdrop-filter: var(--backdrop-filter-blur);
  backdrop-filter: var(--backdrop-filter-blur);
  z-index: -1;
  border-radius: 20px;
}
.header .sub-menu,
.box{
  border: 1px solid var(--border-color-2);
}
.page-loader,
.header-backdrop,
.modal,
.header .sub-menu,
.box,
.style-switcher{
  -webkit-backdrop-filter: var(--backdrop-filter-blur);
  backdrop-filter: var(--backdrop-filter-blur);
}
.modal-backdrop{
  background-color: var(--white);
}
.header-backdrop.active{
  opacity: 1;
}

/* glass dark */
body.t-dark{
  --border-color-2: hsla(0, 0%, 100%, 0.07);
  --border-color-1: hsl(0, 0%, 100%, 0.15);
  --white: hsla(0, 0%, 100%, 0.05);
  --shadow: none;
}
/* control darkness using opacity property */
body.t-dark::before{
  content: '';
  position: fixed;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: var(--BLACK);
  opacity: 0.2;
  z-index: -1;
}

/* Responsive */

@media(max-width: 1199px){
  body{
    padding: 40px 30px;
  }
  html::before{
    left: -35px;
    top: 10%;
  }
  html::after{
    right: -60px;
    bottom: 10%;
  }
}

@media(max-width: 991px){
  .header-menu{
    -webkit-backdrop-filter: var(--backdrop-filter-blur);
    backdrop-filter: var(--backdrop-filter-blur);
  }
  .header .sub-menu{
    border: 0;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  } 
}

@media(max-width: 767px){
   body{
     padding: 35px 15px;
   } 
   html::before{
     left: -50px;
   }
   html::after{
     right: -75px;
   }
}