main {
  margin-bottom: 200%;
}
.floating-menu {
  border-radius: 100px;
  z-index: 999;
  padding-top: 10px;
  padding-bottom: 10px;
  right: -60px; /* Đưa menu sang sát bên phải */
  position: fixed;
  display: inline-block;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}
.floating-menu.show {
    transition: right 0.3s ease-in-out;
    right: 0;
}
.toggle-button {
    position: fixed;
    top: 50%;
    right: 10px;
    background: #167699;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 5px;
    transition: right 0.3s ease-in-out; /* Hiệu ứng mượt */
}
.toggle-button.active {
    right: 60px; /* Di chuyển nút khi menu xuất hiện */
}
.main-menu {
  margin: 0;
  padding-left: 0;
  list-style: none;
}
.main-menu li a {
  display: block;
  padding: 20px;
  color: #fff;
  border-radius: 50px;
  position: relative;
  -webkit-transition: none;
  -o-transition: none;
  transition: none;
}
.main-menu li a:hover {
  background: rgba(244, 244, 244, 0.3);
}
.menu-bg {
  background-image: -webkit-linear-gradient(top, #1c5e91 0, #167699 100%);
  background-image: -o-linear-gradient(top, #1c5e91 0, #167699 100%);
  background-image: -webkit-gradient(
    linear,
    left top,
    left bottom,
    from(#1c5e91),
    to(#167699)
  );
  background-image: linear-gradient(to bottom, #1c5e91 0, #167699 100%);
  background-repeat: repeat-x;
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50px;
  z-index: -1;
  top: 0;
  left: 0;
  -webkit-transition: 0.1s;
  -o-transition: 0.1s;
  transition: 0.1s;
}
.ripple {
  position: relative;
  overflow: hidden;
  transform: translate3d(0, 0, 0);
}
.ripple:after {
  content: "";
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, #000 10%, transparent 10.01%);
  background-repeat: no-repeat;
  background-position: 50%;
  transform: scale(10, 10);
  opacity: 0;
  transition: transform 0.5s, opacity 1s;
}
.ripple:active:after {
  transform: scale(0, 0);
  opacity: 0.2;
  transition: 0s;
}