html, body { 
    height: 100%;
    margin: 0;
    padding: 0;
    width: 100%;
}

body { 
    box-sizing: border-box;
    color:  #1c1c1c;
    display: flex;
    flex-direction: column;
    letter-spacing: 1px;
    line-height: 1.75em; 
    font-family: monospace;
    font-size: 14px;
}

body.modalOpen {
    overflow: hidden;
}

a {
    color: #000;
}

header {
    align-items: center;
    border-bottom: solid 1px #1c1c1c;
    display: flex;
    flex-direction: columns;
    justify-content: space-between;
    padding: 1em;
}

h1 {
    font-size: 1.5em;
    margin: 0;
}

#habits {
    padding: 1em;
}

#about,
#settings {
    background: #fff;
    display: none;
    padding: 1em;
    position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
}

#about.open,
#settings.open {
    display: block;
}

#about h2,
#settings h2 {
    margin-top: 0;
}

footer {
    border-top: solid 1px #1c1c1c;
    padding: 1em;
    user-select: none;
    text-align: center;
}

#clear,
#close-about,
#close-settings {
    background: #ddd;
    border-radius: 4px;
    color: #000;
    font-weight: bold;
    padding: .5em;
    text-decoration: none;
}