#wrapper {
    width: 900px;
}

header {
    background: #f9c;
    padding: 10px;
}

nav {
    background: #3fc;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-around;
}

nav li {}


#content {
    background: red;
    display: flex;

}

main {
    background-color: aqua;
    width: 70%;
}

aside {
    background: green;
    width: 30%;

}

footer {

    background: #f93;

}