body {
    margin: 0;
    height: 100vh;
    display: grid;
    place-items: center;
    background: #f1f5f9;
    color: #1e293b;
    font-family: "Euclid Circular A", "Poppins";
  }
  
  h2,
  h3,
  h4 {
    margin: 0;
    font-weight: 500;
  }
  
  .cards {
    display: flex;
    gap: 30px;
  }
  
article {
    position: relative;
    perspective: 1000px;
    width: 300px;
    height: 300px;
  }
  
  article header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    margin-bottom: 26px;
  }
  
  article header h2 {
    font-size: 20px;
  }

  article .front,
  article .back {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    text-align: center;
    backface-visibility: hidden;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px,
      rgba(0, 0, 0, 0.1) 0px 1px 3px 0px, rgba(0, 0, 0, 0.1) 0px 1px 2px -1px;
    padding: 24px;
    transition: 0.6s;
    cursor: pointer;
  }
  
  .back {
    transform: rotateY(180deg);
  }
    
input {
    position: absolute;
    scale: 0;
  }
  
  input:checked ~ article .back {
    transform: rotateY(0);
  }
  
  input:checked ~ article .front {
    transform: rotateY(-180deg);
  }
  
  article var {
    font-style: normal;
    font-size: 80px;
    line-height: 1;
  }
  
  article h3 {
    margin: 0 0 30px;
    font-weight: 500;
  }
  
#summary :is(var, h3) {
    color: #3b82f6;
  }
  
  #overdue :is(var, h3) {
    color: #ef4444;
  }
  
  #features :is(var, h3) {
    color: #22c55e;
  }
  
  article :is(h4, p) {
    opacity: 0.5;
    font-size: 20px;
  }
  
  article p {
    margin-top: 76px;
  }