.receta__img{
    height: 200px;
    transition: all 0.5s ease-in-out;
    -webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
    -ms-transition: all 0.5s ease-in-out;
    -o-transition: all 0.5s ease-in-out;
}

.receta__img:hover{
    opacity: 0.5;
    cursor: pointer;
    
}