* {box-sizing: border-box;}

*:focus, input:focus + label {
  outline: none;
  box-shadow: #3d406d99;
}

body {
  padding: 30px 30px;
  background: #fff;
  color: #3d406d;
}

main {
  max-width: 1000px;
  margin: auto;
}

h2 {
  text-align: center;
  margin-top: 0;
}

h3 {
  margin: 0 0 12px;
  font-size: 15px;
}

p {
  margin: 0 0 20px;
  font-size: 13px;
  line-height: 1.5;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto 20px;
}

.radiotab {
  position: absolute;
  opacity: 0;
}

.label {
  width: 100%;
  padding: 10px 10px;
  background: #faefe9;
  cursor: pointer;
  font-weight: bold;
  font-size: 14px;
  color: #3d406d99;
  transition: background .3s, color .3s;
  border: none;
  text-align: center;
}

.label:hover {
  background: #d8d8d8;
}

.label:active {
  background: #ccc;  
}

.radiotab:checked + .label {
  background: #fff;
  color: #3d406d;
  border-top: solid 2px #3d406d;
  border-left: solid 2px #3d406d;
  border-right: solid 2px #3d406d;
  border-bottom: none;
}

.panel {
  display: none;
  padding: 30px 60px 30px 60px;
  background: #fff;
  width: 100%;
  border-left: solid 2px #3d406d;
  border-bottom: solid 2px #3d406d;
  border-right: solid 2px #3d406d;
}

.radiotab:checked + .label + .panel {
  display: block;
}

@media (min-width: 600px) {
  .panel {
    order: 99;
  }

  .label {
    width: 33.33%;
    border-bottom: solid 2px #3d406d;
  }

}