.contenedor-post .titulo-post {
    cursor: pointer;
}

.contenedor-post .boton-post {
    transform: rotate(45deg);
    transition: 300ms;
}

.contenedor-post.active .boton-post {
    transform: rotate(0deg);
}

.contenedor-post:not(.active) .contenido-post {
    display: none;
}