.app2 i {
  font-size: 80px;
  
}

article {
  position: relative;
  width: 140px;
  height: 100px;
  margin: 5px;
  float: left;
  border: 2px solid #ff6600;
  box-sizing: border-box;
}

article div {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  line-height: 25px;
  transition: .5s ease;
}

article input {
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 100px;
  opacity: 0;
  cursor: pointer;
}

input[type=checkbox]:checked ~ div {
  background-color: #f60;
  color: white !important;
}

.upgrade-btn {
  display: block;
  margin: 30px auto;
  width: 200px;
  padding: 10px 20px;
  border: 2px solid #f60;
  border-radius: 50px;
  color: #f5f5f5;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  transition: .3s ease;
}

.upgrade-btn:hover {
  background-color: #f60;
}

.blue-color {
  color: #f60;
}

.gray-color {
  color: #555;
}

.social i:before {
  width: 14px;
  height: 14px;
  position: fixed;
  color: #fff;
  background: #0077B5;
  padding: 10px;
  border-radius: 50%;
  top:5px;
  right:5px;
}

@keyframes slidein {
  from {
    margin-top: 100%;
    width: 300%;
  }

  to {
    margin: 0%;
    width: 100%;
  }
}