/* page layout */

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0;
    height: 100vh;
}
div.title, iframe {
    width: 100vw;
    height: 20vh;
    border: none;
}
div.title {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
h1, p {
    margin: 0;
    width: 24em;
}

/* text style */

h1, input, p {
    font-family: monospace;
    font-size: 3em;
}
input {
    color: #333;
    border: 3px solid #999;
    padding: 1em;
}
input:focus {
    border-color: #333;
    outline: none;
}
input::placeholder {
    color: #999;
    opacity: 1;
}

/* test results */

body.test {
    background-color: #666;
    color: #fff;
}
body.ok {
    background-color: #090;
    color: #fff;
}
body.ko {
    background-color: #900;
    color: #fff;
}
body > p {
    display: none;
}
body > p.title,
body.test > p.test,
body.ok > p.ok,
body.ko > p.ko {
    display: block;
}