.cartoes {
   display: flex;
   flex-wrap: wrap;
   align-items: stretch;
}

.cartao {
   flex: 0 0 200px;
   margin: 10px;
   border: 1px solid #ccc;
   box-shadow: 2px 2px 6px rgba(0,0,0,0.3);
   border-radius: 20px;
   overflow: hidden;
   background: #ff00fb;
}

.cartao img {
   max-width: 100%;
   border-radius: 20px 20px 0 0;
}

.cartao .texto {
   padding: 16px;
   text-align: justify;
}

.cartao .texto > button {
   background: rgb(255, 0, 0);
   border: none;
   color: #ffffff;
   padding: 10px;
   width: 100%;
   border-radius: 7px;
   cursor: pointer;
}

/* Par 1/2 - por padrão mostra 1, esconde 2 */
.cartao:nth-of-type(2) {
    display: none;
}
#alternar12:checked ~ .cartoes .cartao:nth-of-type(1) {
    display: none;
}
#alternar12:checked ~ .cartoes .cartao:nth-of-type(2) {
    display: block;
}

/* Par 3/4 - por padrão mostra 3, esconde 4 */
.cartao:nth-of-type(4) {
    display: none;
}
#alternar34:checked ~ .cartoes .cartao:nth-of-type(3) {
    display: none;
}
#alternar34:checked ~ .cartoes .cartao:nth-of-type(4) {
    display: block;
}

/* Par 5/6 - por padrão mostra 5, esconde 6 */
.cartao:nth-of-type(6) {
    display: none;
}
#alternar56:checked ~ .cartoes .cartao:nth-of-type(5) {
    display: none;
}
#alternar56:checked ~ .cartoes .cartao:nth-of-type(6) {
    display: block;
}

.alternar {
   margin: 3px auto 0;
   display: block;
   background: #ff00d4;
   color: #000000;
   border: none;
   border-radius: 9119px;
   padding: 8px 32px;
   font-size: 1rem;
   cursor: pointer;
   width: 100%;
   text-align: center;
}

.alternar:focus {
   background: #b302ff;
}

.descricao-extra {
   margin-top: 10px;
   background: hsl(186, 78%, 63%);
   border-radius: 8px;
   padding: 10px;
   color: #333;
   font-size: .96em;
}