.l-main {
  width: 330px;
  margin-left: 0;
  margin-top: 10px;
  float:left;
}
.r-main {
  width: 100%;
  margin-left: 0;
  float:right;
}
.menu {
  width: 550px;
  margin: 1px;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  border-radius: 5px;
  float: left;
}

.menu__header {
  background: #4B4F55;
  border-bottom: 1px solid #353A40;
  border-radius: 5px 5px 0 0;
}

.menu__header-title {
  color: #fff;
  padding: 15px;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
}

.menu__body {
  border-radius: 0 0 5px 5px;
}

.menu--small {
  width: 110px;
}

.nav {
  list-style: none;
}

.nav__item {
  position: relative;
}

.nav__item-link {
  padding: 10px 15px;
  text-decoration: none;
  color: #8B8E93;
  display: block;
  border-bottom: 1px solid #F0F0F0;
}
.nav__item-link:hover {
  background: #f0f0f0;
}
.nav__item-link.is-active {
  background: #6E757F;
  color: #fff;
  border-bottom-color: #4B4F55;
  box-shadow: 0 1px 0 #7A828D inset;
}
.nav__item-link.is-active:after {
  content: '';
  display: block;
  position: absolute;
  top: 50%;
  right: -6px;
  margin-top: -6px;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 6px solid #6E757F;
}
.nav__item-link.is-active .nav__item-icon {
  color: #fff;
}
.nav__item:last-child .nav__item-link {
  border-bottom: none;
}