body{
    color: white;
    background: linear-gradient(navy,indigo);
    background-attachment: fixed;
    margin: 0;
}

header{
    background-color: black;
    padding: 5px;
    text-align: center;
}

nav{
    position: sticky;
    top: 0;
    width: 100%;
    padding: 5px;
    background-color: gray;
    text-align: center;
}

.content{
    display: flex;
}

main{
    /*background-color: blue;*/
    /*flex: 3;*//*flex: 1;*/
    flex-grow: 1;
}

aside {
    background-color: darkslateblue;
    width: 25%;
    padding: 5px;
}

footer{
    background-color: black;
    padding: 5px;
    text-align: center;
}