header {
    display: flex;
    align-items: center;
}

header .brand {
    display: flex;
    align-items: center;
    max-width: 40%;
}

header .brand img {
    transition: filter 1s;
}
header .brand h1 {
    transition: color 1s;
}
header .brand:hover img {
    filter: brightness(100%) sepia(100%);
}
header .brand:hover h1 {
    color: #d82;
}

.brand h1 {
    margin: 0;
}

.brand img {
    height: 3em;
    filter: brightness(0%);
}

nav {
    flex: 1;
}

nav ol {
    display: flex;
    flex-wrap: wrap;
    padding-left: 0;
    text-align: center;
    list-style-type: none;
}

nav ol li {
    flex: 1;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
}

.main {
    background: #f00;
}

footer {
    margin: auto;
}