style.css

* {
    margin: 0;
}

main {
    font-family: sans-serif;
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
}

h1 {
    background: linear-gradient(905deg, #50caff, #1673ba);
    border-bottom: solid 2px #ccc;
    color: white;
    font-size: 3rem;
    padding: 40px 0;
    margin-bottom: 50px;
}

button {
    background: #02bb70;
    border: 0;
    border-radius: 0 0 3px 3px;
    box-shadow: 0 2px 5px #777, inset 0 -5px 4px -2px #1fe88f;
    color: white;
    cursor: pointer;
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 50px;
    margin: auto;
    width: 100%;
    -webkit-appearance: none;
}

p {
    display: inline;
}

p, span {
    font-size: 1.75rem;
    line-height: 50px;
}

h1, #guess-result {
    text-align: center;
}

.container {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.camera,
.output {
    width: 320px;
}

.border {
    border: solid 1px #ccc;
}

.instructions {
    color: #135;
    display: block;
    line-height: 1.5;
    margin: 40px auto;
    max-width: 900px;
}