body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: 'Corbel', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif
}

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

a, a:visited {
    color: #1B98E0;
}
a:hover {
    color: #13293d;
}

header {
    height: 12.5%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    color: white;
    background-color: #1B98E0;
}
header>h1 {
    margin:0;
    padding: 0;
}
header>p{
    margin: 0;
    text-transform: uppercase;
    font-weight: 100;
    font-size: 12px;
}

main {
    display: flex;
    width: 100%;
    min-height: 75%;
}

article {
    width: 75%;
    padding: 1.25% 1%;
}
article>h1{
    margin: 10px 0;
    margin-top: 0;
}

aside {
    width: 25%;
}
aside>.nav-header {
    width: 100%;
    box-sizing: border-box;
    background-color: #247BA0;
    color: white;
    padding: 12px 4px;
}
.nav-header>h3 {
    margin: 0;
    text-transform: uppercase;
}
nav {
    display: flex;
    flex-direction: column;
    padding: 8px 6px;
}
nav>ul {
    margin: 2px 0;
}
input[type="number"] {
    width: 70px;
}
#diff {
    font-weight: bold;
}

footer {
    display: flex;
    height: 12.5%;
    background-color: #1B98E0;
    color: white;
    align-items: center;
}
footer>p {
    margin: auto;
    text-align: center;
}