body {
  color: rgba(255,255,255,.75);
  font-family: Inter, sans-serif;
  background-color: #1c1e1f;
  background-image: linear-gradient(0deg,transparent calc(80px),#444 calc(81px)),linear-gradient(90deg,transparent calc(80px),#444 calc(81px));
  background-size: calc(81px) calc(81px);
  background-attachment: fixed;
  overflow-y: scroll;
}

h1 {
  font-weight: 300;
  font-size: 40px;
  font-family: Oswald, sans-serif;
  line-height: 54px;
  margin-top: 0;
}

a:link, a:visited {
  color: lime;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  margin: 0;
  padding:0;
  width: calc(270px);
  height: 100vh;
  border-right: 1px solid #cccccc;

  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  background-color: rgba(0,0,0,.3);
  z-index: 999;
}

main {
  margin: 80px 30px 0 350px;

}

nav > ul {
  margin: 0;
  padding: 0;
  width: 100%;
  text-transform: uppercase;
}
  nav > ul > li {
    list-style: none;
    width: 100%;
    min-height: 54px;
    border-bottom: 1px solid #cccccc;
  }
    nav > ul > li > a {
      padding-bottom: 0;
      margin-left: 27px;
      width: 100%;
      height: 54px;
      font-family: Oswald,sans-serif;
      font-size: 12px;
      font-weight: 400;
      line-height: 54px;
      letter-spacing: 4px;
      text-decoration: none;
      color: #cccccc;
    }

    nav > ul > li > a:link, nav > ul > li > a:visited {
      color: #cccccc;
    }

    nav > ul > li > a:hover {
      cursor: pointer;
      color: #ffffff;
    }

nav .sub-menu {
  flex-direction: column;
  justify-content: right;
}
.sub-menu > div {
  border-bottom: 1px solid green;
}
nav .sub-menu a {
  display: flex;
  justify-content: right;
  padding: 0 20px 0 0;
  height: 44px;
  font-family: Oswald,sans-serif;
  font-size: 11px;
  font-weight: 200;
  line-height: 44px;
  letter-spacing: 2px;
  text-decoration: none;
  color: #cccccc;
}

#nav-why-booster, #nav-purchase-options, #nav-how-does-it-work {
  display: none;
}

.back {
  position: relative;
  background-image: linear-gradient(0deg,transparent calc(26px),#333 27px),linear-gradient(90deg,transparent calc(26px),#333 27px);
  background-size: 27px 27px;
  background-attachment: fixed;
}

.logo {
  display: flex;
  justify-content: center;
  margin: 27px 0 56px 0;
}

  .logo > img{
    width: 200px;
    height: 50px;
  }

.title-topper {
  font-family: Oswald, sans-serif;
}

  .title-topper > div {
    color: #54a653;
    border-bottom:4px solid #54a653;
    font-size: 18px;
    letter-spacing: .2em;
    font-weight: 400;
  }
  .title-topper .left {
    text-align: left;
  }
  .title-topper .right {
    text-align: right;
  }

.divider {
  clear: both;
  margin-bottom: 30px;
}