html {
    box-sizing: border-box;
    font-size: 62.5%;
}

*,
*:before,
*:after {
    box-sizing: inherit;
}

body {
    font-family: 'Raleway', sans-serif;
    font-size: 1.6rem;
    line-height: 2;
}

img {
    max-width: 100%;
}

h1 {
    font-size: 4rem;
}

h2 {
    font-size: 3.2rem;
}

p {
    font-size: 2rem;
}

.contenedor {
    max-width: 1200px;
    width: 95%;
    margin: 0 auto;
}

.entrada-blog a {
    display: inline-block;
    background-color: #2196F3;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
}


/** CODIGO AQUI **/

@media (min-width: 768px ){
    .layout-shifter{
        display: grid;
        grid-template-areas: "contenido" 
                              "inferior";
    }  
    .sidebar{
        grid-area: inferior;
    }
     .contenido-principal{
        grid-area: contenido;
        display: grid;
        grid-template-areas: "entrada2 entrada1";
        grid-template-columns: repeat(2, 1fr);
        column-gap: 3rem;
    }  
}
@media (min-width: 992px){
    .layout-shifter{
        grid-template-areas:"contenido sidebar" ;
        column-gap: 2rem;
    }
    .sidebar{
        grid-area: sidebar;
    }
 .contenido-principal{
        grid-area: contenido;
        grid-template-areas: "entrada1"
                             "entrada2";
        grid-template-columns: unset;
    }
}
    
 



     /* @media (min-width: 768px ){
        .layout-shifter{
            display: grid;
            grid-template-areas: "contenido" 
                                  "inferior";
            
        }
        .sidebar{
            grid-area: inferior;
        }
    
        .contenido-principal{
            grid-area: contenido;
            display: grid;
            grid-template-columns: "entrada2 entrada1";
            grid-template-columns: repeat(2, 1fr);
            column-gap: 3rem;
        }
    }  codigo de ejemplo de gif de layoutshifter 2*/