body {
    background-color: antiquewhite;
    height: 100%;
}

.navbar {
    background-color: steelblue;
}

.navbar-default .navbar-brand, .navbar-default .navbar-nav>li>a {
    color: white;
}

.flex-container {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    justify-content: normal;
    align-items: normal;
    align-content: normal;
    padding: 20px;
    margin-top: 40px;
    margin-bottom: 40px;
    background-color: antiquewhite;
}

.flex-items {
    padding: 20px;
}

.flex-items:nth-child(1) {
    display: block;
    flex-grow: 0;
    flex-shrink: 1;
    flex-basis: auto;
    align-self: auto;
    order: 0;
    font-size: 28px;
    text-align: center;
    margin: 0 auto 20px;
}

.flex-items:nth-child(2) {
    display: block;
    flex-grow: 0;
    flex-shrink: 1;
    flex-basis: auto;
    align-self: auto;
    order: 0;
    margin: 0 auto;
}

#keyboard {
    width: 450px;
    border: 2px solid black;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    grid-row-gap: 12px;
    padding: 12px;
    margin: 0 auto;
    background-color: slategray;
    opacity: 0;
}

.keyboard-key {
    width: 100px;
    height: 100px;
    border: 2px solid black;
    margin: 2px;
    background-color: white;
}

#keyboard-key:nth-child(1) {
    grid-area: 1 / 1 / 2 / 2;
}

#keyboard-key:nth-child(2) {
    grid-area: 1 / 2 / 2 / 3;
}

#keyboard-key:nth-child(3) {
    grid-area: 1 / 3 / 2 / 4;
}

#keyboard-key:nth-child(4) {
    grid-area: 1 / 4 / 2 / 5;
}

#keyboard-key:nth-child(5) {
    grid-area: 2 / 1 / 3 / 2;
}

#keyboard-key:nth-child(6) {
    grid-area: 2 / 2 / 3 / 3;
}

#keyboard-key:nth-child(7) {
    grid-area: 2 / 3 / 3 / 4;
}

#keyboard-key:nth-child(8) {
    grid-area: 2 / 4 / 3 / 5;
}

#letterbox {
    min-height: 100px;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: normal;
    align-content: normal;
}

.letterbox-letter, .letterbox-letter-hl {
    width: 20px;
    height: 36px;
    font-size: 24px;
    font-weight: bold;
    color: black;
    border-bottom: solid black 2px;
    margin: 4px;
    display: block;
    flex-grow: 0;
    flex-shrink: 1;
    flex-basis: auto;
    align-self: auto;
    order: 0;
}

.letterbox-letter-hl {
    border: solid black 2px;
    background-color: yellow;
}

#typing-text {
    visibility:hidden;
    position: absolute;
}

#startButton {
    width: 200px;
    font-size: 36px;
    background-color: steelblue;
}

#content-area {
    border: 2px solid black;
    margin-top: 100px;
    border-radius: 4px;
}