body {
  background: #CDD9ED;
}
.container {
  position: relative;
  width: 380px;
  margin: 50px auto;
}
.menu {
  z-index: 1;
  position: absolute;
  top: -8px;
  right: -8px;
  display: block;
  width: 30px;
  height: 30px;
  cursor: pointer;
  color: #99A3BA;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #CDD9ED;
  background: #fff;
  transition: all .3s ease;
}
#checkTab {
  display: none;
}
.menu .icon {
  position: absolute;
  top: 15px;
  left: 8px;
  width: 12px;
  height: 1px;
  background: currentColor;
  transition: width .3s ease;
}
.menu .icon:before {
  content: '';
  position: absolute;
  top: -5px;
  left: 0;
  width: 14px;
  height: 1px;
  background: currentColor;
  transition: width .3s;
}
.menu .icon:after {
  content: '';
  position: absolute;
  top: 5px;
  left: 0;
  width: 12px;
  height: 1px;
  background: currentColor;
  transition: width .3s;
}
#checkTab:checked ~ .menu:hover {
  transform: rotate(45deg);
}
#checkTab:not(:checked) ~ .menu {
  box-shadow: 0 2px 12px -2px rgba(18, 22, 33, .1);
}
#checkTab:not(:checked) ~ .menu:hover .icon,
#checkTab:not(:checked) ~ .menu:hover .icon::before,
#checkTab:not(:checked) ~ .menu:hover .icon::after {
  width: 14px;
  transition: all .3s ease;
}
#checkTab:not(:checked) ~ .menu:hover .icon {
  background: currentColor;
}
#checkTab:not(:checked) ~ .tabs {
  display: none;
}
#checkTab:checked ~ .menu .icon {
  background: transparent;
}
#checkTab:checked ~ .menu .icon:before {
  width: 14px;
  position: absolute;
  top: 0px;
  transform: rotate(45deg);
  transition: all .3s ease;
}
#checkTab:checked ~ .menu .icon:after {
  width: 14px;
  position: absolute;
  top: 0px;
  transform: rotate(-45deg);
  transition: all .3s ease;
}

.tabs {
  width: 380px;
  border-radius: 6px;
  box-shadow: 0 4px 24px -2px rgba(18, 22, 33, .1);
  background: #fff;
  color: #6C7486;
}
.nav-box {
  font-size: 0;
}
button {
  z-index: 10;
  position: relative;
  width: 24%;
  height: 60px;
  margin-left: 6%;
  margin-bottom: -1px;
  box-sizing: border-box;
  outline: none;
  background: #fff;
  border: 0;
  border-radius: 6px 6px 0 0;
  font-size: 12px;
  font-weight: 500;
  color:  #99A3BA;
  cursor: pointer;
}
button:focus-within {
  border-bottom: 1px solid #5628EE;
  color: #5628EE;
  transition: color .3s ease;
}
.content-box {
  position: relative;
  width: 100%;
  height: 300px;
  border-top: 1px solid #E4ECFA;
  border-radius: 0 0 6px 6px;
  background: #fff;
  font-size: 14px;
}
.content-box > div {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: none;
}
.nav-box:not(:focus-within) .nav-a {
  border-bottom: 1px solid #5628EE;
  color: #5628EE;
}
.nav-box:not(:focus-within) .content-a {
  display: block;
}
.nav-a:focus-within ~ .content-box .content-a {
  display: block;
}
.nav-b:focus-within ~ .content-box .content-b {
  display: block;
}