html {
    box-sizing: border-box;
}

* {
    box-sizing: inherit;
}

body {
    display: flex;
    flex-wrap: wrap;
    flex-flow: column;
    line-height: 1.5;
    background: rgb(238, 238, 238);
    height: 100vh;
    font-family: Helvetica, sans-serif;
}

footer {
    color: white;
    background: rgb(102, 102, 102);
}

header {
    border-bottom: 2px solid black;
    padding-left: 32px;
}

.site-title {
    margin: 0;
    font-size: 34px;
}

.main-content,
footer {
    padding: 20px 0 0 32px;
}

.fill-empty{
    display: flex;
    flex-direction: column;
    flex: 1
}