.centrar{
     position: absolute;
    left: 50%;
    transform: translate(-50%, 0);

    }

    .centrar_contenido {
          position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        text-align: center;
        border-style: solid;
        border-color: 1px red;
        padding-bottom: 20px;
        border-radius: 8px;
        }

        .tachar {
    text-decoration: line-through;
    font-style: italic;
    color: #6c757d; /* color gris bootstrap-muted */
  }