tabs.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  align-items: center;
  display: flex;
  background: #f7f8f8;
  color: #252525;
  font-family: "Trebuchet MS", sans-serif;
}

p {
  margin-bottom: 10px;
}

h3 {
  margin-bottom: 10px;
}

input {
  border-radius: 2px;
  border: 1px solid rgba(187, 187, 187, 0.5);
  box-shadow: none;
  font-family: "Trebuchet MS", sans-serif;
  font-size: 18px;
  margin: 5px auto 10px;
  padding: 10px;
  transition: all 0.3s ease;
  width: 100%;
}

input:focus {
  border-color: #bbb;
  outline: none;
}

input.filled {
  border: 1px solid rgba(255, 0, 153, 0.6);
}

.content {
  margin: 0 auto;
  max-height: 100%;
  max-width: 720px;
  padding: 20px 0;
}

.tabs-list {
  list-style: none;
  margin-bottom: 10px;
}

.tabs-item {
  border: 1px solid #F09;
  cursor: pointer;
  float: left;
  margin-right: -1px;
  padding: 10px 15px;
  transition: all 0.3s ease;
  user-select: none;
}

.tabs-item:hover {
  background: rgba(255, 0, 153, 0.6);
  color: #FFF;
}

.tabs-item.active {
  background: #F09;
  color: #FFF;
}

.tabs-item.disabled {
  background: #fff;
  color: #bcbcbc;
  cursor: default;
}

.tab-result,
.tab-content {
  clear: both;
  display: none;
  line-height: 1.5;
  padding: 10px 0;
}

.tab-result.active,
.tab-content.active {
  display: block;
}