body {
    margin: 0;
    font-weight: bold;
}

h1 {
    font-weight: bold;
}

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

.js-display-clock {
    background-color: whitesmoke;
    color: black;
    padding: 2px 40px 2px 40px;
    border-radius: 10px;
    border: 1px solid black;
    text-align: center;
    font-size: 100px;
    box-shadow: 2px 2px 0px 1px black;
}

.div {
    display: flex;
    gap: 20px;
}

.btn {
    font-size: 25px;
}

.js-start-button,
.js-stop-button {
    font-weight: 700;
}