* {
  margin: 0;
  padding: 0;
  font-family: "Rubik", sans-serif;
  list-style: none;
  text-decoration: none;
}


.menu {
  width: 360px;
  border-radius: 8px;
  overflow: hidden;
}

.item {
  border-top: 1px solid #f1f1f1;
  position: relative;
  overflow: hidden;
}
.item input[type=checkbox] {
  width: 100%;
  height: 100%;
  position: absolute;
  z-index: 1;
  opacity: 0;
  cursor: pointer;
  background: #3c3c3c;
}
.item input[type=checkbox]:checked ~ .smenu {
  max-height: 27em;
}

.btn {
  display: block;
  padding: 16px 20px;
  background: #3c3c3c;
  position: relative;
}
.btn1 {
  display: block;
  padding: 16px 20px;
  background: #37AFFF;
  position: relative;
  text-align:center
}
.btn2 {
  display: block;
  padding: 16px 20px;
  background: #0097FB;
  position: relative;
  text-align:center
}
.btn3 {
  display: block;
  padding: 16px 20px;
  background: #0082D9;
  position: relative;
  text-align:center
}
.btn4 {
  display: block;
  padding: 16px 20px;
  background: #0062A4;
  position: relative;
  text-align:center
}
.btn5 {
  display: block;
  padding: 16px 20px;
  background: #004879;
  position: relative;
  text-align:center
}
.btn6 {
  display: block;
  padding: 16px 20px;
  background: #002741;
  position: relative;
  text-align:center
}
.btn::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #3c3c3c;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn1::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #37AFFF;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn2::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #0097FB;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn3::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #0082D9;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn4::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #0062A4;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn5::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #004879;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn6::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #002741;
  left: 20px;
  bottom: -7px;
  transform: rotate(45deg);
}
.btn i {
  margin-right: 10px;
  color: white
}
.btn1 i {
  margin-right: 10px;
  color: white
}
.btn2 i {
  margin-right: 10px;
  color: white
}
.btn3 i {
  margin-right: 10px;
  color: white
}
.btn4 i {
  margin-right: 10px;
  color: white
}
.btn5 i {
  margin-right: 10px;
  color: white
}
.btn6 i {
  margin-right: 10px;
  color: white
}
.smenu {
  background: #4d5160;
  overflow: hidden;
  transition: max-height 0.3s;
  max-height: 0;
  position: relative;
  z-index: 10;
}
.smenu a {
  display: block;
  padding: 16px 26px;
  color: #ffb650;
  font-size: 14px;
  margin: 4px 0;
  position: relative;
}
.smenu a:before {
  content: "";
  color:#FFF
  position: absolute;
  width: 6px;
  height: 100%;
  background: #3c3c3c;
  left: 0;
  top: 0;
  opacity: 0;
  transition: 0.3s;
}
.smenu a:hover:before {
  opacity: 1;
}