*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* FLEX  */

.container{
    width: 900px;
    height: 500px;
    border:1px solid black;
    display: flex;
} 

.navigation {
    border:1px solid black;
    flex: 1;
    order: 1;

}

.content {
    border:1px solid black;
    flex: 4;
    order: 2;
    background-color: pink;
    display: flex;
    flex-direction: column;
}

/* CONTENT  */

.content header{
    flex: 3;
    order: 1;
    border:1px solid black;
    background-color: red;
    display: flex;
    justify-content: center;
    align-items: center;
}


.media {
    flex: 10;
    order: 3;
    border: 1px solid black;
}

.media-nav {
    flex: 1;
    order: 2;
    border:1px solid black;
    display: flex;
}

.media-nav ul {
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
    flex: 1; 
    margin: 0; 
    padding: 0; 
}


.media-nav ul li {
    flex: 1;
    text-align: center;
}