* {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Montserrat', sans-serif;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: #000;
}

h2 {
  text-align: center;
  margin: 20px auto;
  color: #fff;
}

.accordion-menu {
  width: 100%;
  max-width: 350px;
  margin: 0;        /* 移除居中的 margin */
  background: #fff;
  border-radius: 4px;

}

.accordion-menu li.open .dropdownlink {
  color: #396fdc;
}
.accordion-menu li.open .dropdownlink .fa-chevron-down {
  -webkit-transform: rotate(180deg);
          transform: rotate(180deg);
}

.accordion-menu li:last-child .dropdownlink {
  border-bottom: 0;
}

.dropdownlink {
  cursor: pointer;
  display: block;
  padding: 15px 15px 15px 45px;
  font-size: 18px;
  border-bottom: 1px solid #ccc;
  color: #212121;
  position: relative;
  -webkit-transition: all 0.4s ease-out;
  transition: all 0.4s ease-out;
}
.dropdownlink i {
  position: absolute;
  top: 17px;
  left: 16px;
}
.dropdownlink .fa-chevron-down {
  right: 12px;
  left: auto;
}

.submenuItems {
  display: none;
  background: #C8E6C9;
}
.submenuItems li {
  border-bottom: 1px solid #B6B6B6;
}

.submenuItems a {
  display: block;
  color: #727272;
  padding: 12px 12px 12px 45px;
  -webkit-transition: all 0.4s ease-out;
  transition: all 0.4s ease-out;
}
.submenuItems a:hover {
  background-color: #8b39dc;
  color: #fff;
}
/* 激活状态的菜单的高亮样式 */
.submenuItems a.active {
  background-color: #8b39dc;
  color: #fff;
}