body {
  min-height: 100vh;
  background: linear-gradient( to right top, #360033, #0b8793);
  font-family: sans-serif;
}
.site-nav {
  padding: 0 20px;
}
.site-nav ul, .login-button button {
  list-style: none;
  padding: 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.site-nav li {
  display: inline-block;
}
.nav-item {
  margin-right: 30px;
  color: #FFF;
}

.nav-item__label {
  cursor: pointer;
  padding-bottom: 3px;
}

.nav-item__radio {
  pointer-events: none;
  position: absolute;
  opacity: 0;
}

.nav-item__radio:checked ~ .nav-item__label {
  border-bottom: 1px solid;
}

.login-button button {
  background: transparent;
  color: white;
  border: 1px solid;
  padding: 6px 10px;
  border-radius: 12px;
  cursor: pointer;
}

.login-button button:hover {
  background: white;
  color: #0b8793;
  border-color: white;
}