style.css

main {
  display: flex;
  flex-wrap: nowrap;
  height: 100vh;
  height: -webkit-fill-available;
  overflow-x: auto;
  overflow-y: hidden;
}
main > * {
  flex-shrink: 0;
  min-height: -webkit-fill-available;
}

.b-example-divider {
  width: 1.5rem;
  height: 100%;
  background-color: rgba(0, 0, 0, .1);
  border: solid rgba(0, 0, 0, .15);
  border-width: 1px 0;
  box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
}


.dropdown-toggle { outline: 0; }

.nav-flush .nav-link {
  border-radius: 0;
}

.btn-toggle {
  display: inline-flex;
  align-items: center;
  padding: .25rem .5rem;
  font-weight: 600;
  color: rgba(0, 0, 0, .65);
  background-color: transparent;
  border: 0;
}
.btn-toggle:hover,
.btn-toggle:focus {
  color: rgba(0, 0, 0, .85);
  background-color: #d2f4ea;
}

.btn-toggle::before {
  width: 1.25em;
  line-height: 0;
  content: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='rgba%280,0,0,.5%29' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 14l6-6-6-6'/%3e%3c/svg%3e");
  transition: transform .35s ease;
  transform-origin: .5em 50%;
}

.btn-toggle[aria-expanded="true"] {
  color: rgba(0, 0, 0, .85);
}
.btn-toggle[aria-expanded="true"]::before {
  transform: rotate(90deg);
}

.btn-toggle-nav a {
  display: inline-flex;
  padding: .1875rem .5rem;
  margin-top: .125rem;
  margin-left: 1.25rem;
  text-decoration: none;
}
.btn-toggle-nav a:hover,
.btn-toggle-nav a:focus {
  background-color: #d2f4ea;
}

.scrollarea {
  overflow-y: auto;
}

.fw-semibold { font-weight: 600; }
.lh-tight { line-height: 1.25; }

ul
{
  height: 100vh;
}

.content-left{
  float: left;
  width: 25%;
}

.content-right{
  float: right;
  width: 75%;
}