body {
    background-color: lightblue;

}

.flex-container {
    border:1px solid black;
    background: lightgray;
    padding: 20px;

    /* ESTO SIGNIFICA SER RESPONSIVE */
    display: flex;
    /* flex-direction: column-reverse;
    flex-wrap: wrap; */
    flex-flow: row wrap;
    /* justify-content: space-around; */
    justify-content: space-between;
    align-content: center;
    width: 80%;
    margin: 0 auto;
}

.caja{
    border: 1px solid black;
    background-color:white;
    color: black;
    font-family:'Courier New', Courier, monospace;
    font-weight: bold;
    /* width: 120px;
    height: 120px; */
    line-height: 120px;
    text-align: center;
    margin: 5px;
    /* float: left; */
}

.c1 {
    background: lightpink;
    order: 3; /* orden respecto a las cajas */
    flex-grow: 1; /* prioridad de ancho */
}   

.c2 {
    background: lightgreen;
    order: 1;
    flex-grow: 5;
}

.c3 {
    background: lightcyan;
    order: 2;
    flex-grow: 1;
    flex-basis:50%; /* ancho mínimo */
}

/* CLASE DE CSS GRID LAYOUT CON WASHINGTON */

.grid-layout{
    display: grid;
    /* grid-template-columns:auto auto auto auto;
    grid-template-rows: 100px auto 200px; */
    background: lightgray;
    border: 1px solid black;
    padding: 20px;
    height: 700px;
    width: 80%;
    margin: 0 auto;

    grid-template-areas:'cabecera cabecera'
                        'menu menu'
                        'contenido lateral'
                        'pie pie';
    grid-template-columns: 80% 20%;
    grid-template-rows:10% 5% auto 10%;
}

/* .box{
    border: 4px solid black;
    background-color: lightcoral;
    width: 120px;
    height: 120px;
    margin: 15px;
    line-height: 100px;
} */

.a1 {
    grid-area:cabecera;
    background: lightcoral;
}
.a2 {
    grid-area:menu;
    background: lightgreen;
}
.a3 {
    grid-area:contenido;
    background: lightyellow;
}
.a4 {
    grid-area:lateral;
    background: lightsalmon;
}
.a5 {
    grid-area:pie;
    background: blueviolet;
}

/* Tercera clase con WASHINGTON */
#tercera-clase{
    background: lightgray;
    margin: 0px;
    padding: 0px;
}

@keyframes rebotar{
    0%{
        transform: translateY(0);
    }
    50%{
        transform: translateY(-100px);
    }
    100%{
        transform: translateY(0);
    }
}

.navegacion{
    transform: translateY(-100%);
    animation-name: rebotar;
    animation-duration: 3s;
    animation-iteration-count: infinite;
}

.menu li{
    font-family:'Courier New', Courier, monospace;
    font-size: 20px;
    font-weight:bold;
    padding:15px;
}