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

html,
body {
    height: 100%;
}

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

nav,
footer {
    background-color: #2D61A6;
}

main {
    flex: 1 0 auto;
}

.scrollspy-example {
    height: 50vh;
    margin-top: .5rem;
    overflow: auto;
}