.tudo{
  display: flex;
}

.cartao{
  border: 1px solid #000;
  text-align: center;
  margin: 2px;
  width: 120px;
  padding: 5px;
}
 
p{
  font-size: 12px;
  color: #555;
  margin: 0px
}
 
#op100{
  opacity: 1.0;
}
 
#op50{
  opacity: 0.5;
}
 
#op25{
  opacity: 0.25;
}