* {
    box-sizing: border-box;
}

body {
    max-width: 500px;
    margin: 2em auto;
    padding: 0 0.5em;
    font-size: 20px;
}

h1 {
    text-align: center;
}

.hidden {
    display: none;
}

.buttons-wrapper {
    text-align: center;
}

.button-demo {
    padding: 0.5em;
    margin: 1em auto;
}

.g-info {
    font-weight: bold;
}

#log {
    height: 200px;
    width: 100%;
    overflow-y: scroll;
    border: 1px solid #333333;
    line-height: 1.3em;
}

.author {
    display: block;
    margin-top: 1em;
}